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Version history for Mozilla Firefox (PortableApps)

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Changes for v62.0.2 - v62.0.3

  • Fixed hangs on macOS Mojave (10.14) when various dialog windows (upload, download, print, etc) are activated (bug 1489785)
  • Fixed playback of some encrypted video streams on macOS (bug 1491940)
  • Various security fixes


Changes for v50.0 - v50.0.2

  • Various security fixes


Changes for v49.0.1 - v50.0

  • New
  • Updates to keyboard shortcuts
  • Set a preference to have Ctrl+Tab cycle through tabs in recently used order
  • View a page in Reader Mode by using Ctrl+Alt+R (command+alt+r on Mac)
  • Added option to Find in page that allows users to limit search to whole words only
  • Added Guarani (gn) locale
  • Increased availability of WebGL to more than 98 percent of users on Windows 7 and newer
  • Added download protection for a large number of executable file types on Windows, Mac and Linux
  • Improved performance for SDK extensions or extensions using the SDK module loader
  • Playback video on more sites without plugins with WebM EME Support for Widevine on Windows and Mac
  • Fixed
  • Fixed rendering of dashed and dotted borders with rounded corners (border-radius)
  • Various security fixes
  • Login cookies are now saved for sites with a high number of cookies (Bug 1264192)
  • Changed
  • Added a built-in Emoji set for operating systems without native Emoji fonts (Windows 8.0 and lower and Linux)
  • Blocked versions of libavcodec older than 54.35.1
  • The link to check for plugin security updates has been removed from the addon manager as Firefox automatically checks for plugin updates


Changes for v38.0 - v38.0.1

  • FIXED: Systems with first generation NVidia Optimus graphics cards may crash on start-up
  • FIXED: Users who import cookies from Google Chrome can end up with broken websites
  • FIXED: Large animated images may fail to play and may stop other images from loading
  • FIXED: WebRTC H264 video streams from CiscoSpark native clients are not decoded correctly. (Fixed in Firefox ESR 38.0.1; was already fixed in Firefox 38.0)
  • Known Issues
  • UNRESOLVED: Responsive images do not update when the enclosing viewport changes


Changes for v37.0.2 - v38.0

  • What’s New
  • NEW: New tab-based preferences
  • NEW: Ruby annotation support
  • NEW: Base for the next ESR release.
  • CHANGED: autocomplete=off is no longer supported for username/password fields
  • CHANGED: URL parser avoids doing percent encoding when setting the Fragment part of the URL, and percent decoding when getting the Fragment in line with the URL spec
  • CHANGED: RegExp.prototype.source now returns "(?:)" instead of the empty string for empty regular expressions
  • CHANGED: Improved page load times via speculative connection warmup
  • HTML5: WebSocket now available in Web Workers
  • HTML5: BroadcastChannel API implemented
  • HTML5: Implemented srcset attribute and element for responsive images
  • HTML5: Implemented DOM3 Events KeyboardEvent.code
  • HTML5: Mac OS X: Implemented a subset of the Media Source Extensions (MSE) API to allow native HTML5 playback on YouTube
  • HTML5: Implemented Encrypted Media Extensions (EME) API to support encrypted HTML5 video/audio playback (Windows Vista or later only)
  • HTML5: Automatically download Adobe Primetime Content Decryption Module (CDM) for DRM playback through EME (Windows Vista or later only)
  • DEVELOPER: Optimized-out variables are now visible in Debugger UI
  • DEVELOPER: XMLHttpRequest logs in the web console are now visually labelled and can be filtered separately from regular network requests
  • DEVELOPER: WebRTC now has multistream and renegotiation support
  • DEVELOPER: copy command added to console
  • FIXED: Various security fixes
  • Known Issues
  • UNRESOLVED: Responsive images do not update when the enclosing viewport changes


Changes for v37.0.1 - v37.0.2

  • What’s New
  • Fixed: Google Maps may render incorrectly in some cases
  • Fixed: Stability fixes for select graphics hardware and feature sets
  • Fixed: Various security fixes


Changes for v37.0 - v37.0.1

  • What’s New
  • Changed: Disabled HTTP/2 AltSvc
  • Fixed: Start-up crash due to graphics hardware and third party software
  • Fixed: Various security fixes


Changes for v36.0.3 - v36.0.4

  • What’s New
  • Fixed: 36.0.4: Security fixes for issues disclosed at HP Zero Day Initiative's Pwn2Own contest
  • New: Pinned tiles on the new tab page can be synced
  • New: Support for the full HTTP/2 protocol. HTTP/2 enables a faster, more scalable, and more responsive web.
  • New: Locale added: Uzbek (uz)
  • Changed: -remote option removed
  • Changed: No longer accept insecure RC4 ciphers whenever possible
  • Changed: Phasing out Certificates with 1024-bit RSA Keys
  • Changed: Shut down hangs will now show the crash reporter before exiting the program
  • Changed: Add-on Compatibility
  • HTML5: Support for the ECMAScript 6 Symbol data type added
  • HTML5: unicode-range CSS descriptor implemented
  • HTML5: CSSOM-View scroll behavior implemented allowing smooth scrolling of content without custom libraries
  • HTML5: object-fit and object-position implemented. Defines how and where the content of a replaced element is displayed
  • HTML5: isolation CSS property implemented. Create a new stacking context to isolate groups of boxes to control which blend together
  • HTML5: CSS3 will-change property implemented. Hints the browser of elements that will be modified. The browser will perform some performance optimization for these
  • HTML5: Improved ES6 generators for better performance
  • HTML5: Changed JavaScript 'const' semantics to conform better to the ES6 specification. The const declaration is now block-scoped and requires an initializer. It also can not be redeclared anymore.
  • Developer: Eval sources now appear in the Debugger. Debug JavaScript code that is evaluated dynamically, either as a string passed to eval() or as a string passed to the Function constructor
  • Developer: DOM Promises inspection
  • Developer: Inspector: More paste options in markup view
  • Fixed: 36.0.3: Security fixes for issues disclosed at HP Zero Day Initiative's Pwn2Own contest
  • Fixed: 36.0.1 - Hello may become inactive until restart (1137469)
  • Fixed: 36.0.1 - Print preferences may not be preserved (1136855)
  • Fixed: 36.0.1 - Hello contact tabs may not be visible (1137141)
  • Fixed: 36.0.1 - Disable the usage of the ANY DNS query type (1093983)
  • Fixed: 36.0.1 - Fixed a startup crash with EMET (1137050)
  • Fixed: 36.0.1 - WebGL may use significant memory with Canvas2d (1137251)
  • Fixed: 36.0.1 - Accept hostnames that include an underscore character ("_") (1136616)
  • Fixed: 36.0.1 - Option -remote has been restored (1080319)
  • Fixed: 36.0.1 - Fix a top crash
  • Fixed: Various security fixes
  • Fixed: CSS gradients work on premultiplied colors
  • Fixed: Fix some unexpected logout from Facebook or Google after restart
  • Known Issues
  • unresolved: Style Editor: Extra white space appearing above the editor for a sourcemapped scss file (1128747)
  • unresolved: For users who removed the Share & Hello buttons, this new version brings them back unexpectedly (1136300)
  • unresolved: Firefox Hello does not work for link generators if there is no camera installed (1106941)


Changes for v36.0.1 - v36.0.3

  • What’s New
  • Fixed: 36.0.3: Security fixes for issues disclosed at HP Zero Day Initiative's Pwn2Own contest
  • New: Pinned tiles on the new tab page can be synced
  • New: Support for the full HTTP/2 protocol. HTTP/2 enables a faster, more scalable, and more responsive web.
  • New: Locale added: Uzbek (uz)
  • Changed: -remote option removed
  • Changed: No longer accept insecure RC4 ciphers whenever possible
  • Changed: Phasing out Certificates with 1024-bit RSA Keys
  • Changed: Shut down hangs will now show the crash reporter before exiting the program
  • Changed: Add-on Compatibility
  • HTML5: Support for the ECMAScript 6 Symbol data type added
  • HTML5: unicode-range CSS descriptor implemented
  • HTML5: CSSOM-View scroll behavior implemented allowing smooth scrolling of content without custom libraries
  • HTML5: object-fit and object-position implemented. Defines how and where the content of a replaced element is displayed
  • HTML5: isolation CSS property implemented. Create a new stacking context to isolate groups of boxes to control which blend together
  • HTML5: CSS3 will-change property implemented. Hints the browser of elements that will be modified. The browser will perform some performance optimization for these
  • HTML5: Improved ES6 generators for better performance
  • HTML5: Changed JavaScript 'const' semantics to conform better to the ES6 specification. The const declaration is now block-scoped and requires an initializer. It also can not be redeclared anymore.
  • Developer: Eval sources now appear in the Debugger. Debug JavaScript code that is evaluated dynamically, either as a string passed to eval() or as a string passed to the Function constructor
  • Developer: DOM Promises inspection
  • Developer: Inspector: More paste options in markup view
  • Fixed: 36.0.1 - Hello may become inactive until restart (1137469)
  • Fixed: 36.0.1 - Print preferences may not be preserved (1136855)
  • Fixed: 36.0.1 - Hello contact tabs may not be visible (1137141)
  • Fixed: 36.0.1 - Disable the usage of the ANY DNS query type (1093983)
  • Fixed: 36.0.1 - Fixed a startup crash with EMET (1137050)
  • Fixed: 36.0.1 - WebGL may use significant memory with Canvas2d (1137251)
  • Fixed: 36.0.1 - Accept hostnames that include an underscore character ("_") (1136616)
  • Fixed: 36.0.1 - Option -remote has been restored (1080319)
  • Fixed: 36.0.1 - Fix a top crash
  • Fixed: Various security fixes
  • Fixed: CSS gradients work on premultiplied colors
  • Fixed: Fix some unexpected logout from Facebook or Google after restart
  • Known Issues
  • unresolved: Style Editor: Extra white space appearing above the editor for a sourcemapped scss file (1128747)
  • unresolved: For users who removed the Share & Hello buttons, this new version brings them back unexpectedly (1136300)
  • unresolved: Firefox Hello does not work for link generators if there is no camera installed (1106941)


Changes for v36.0 - v36.0.1

  • What’s New
  • Fixed: 36.0.1 - Disable the usage of the ANY DNS query type (1093983)
  • Fixed: 36.0.1 - Fixed a startup crash with EMET (1137050)
  • Fixed: 36.0.1 - Hello may become inactive until restart (1137469)
  • Fixed: 36.0.1 - Print preferences may not be preserved (1136855)
  • Fixed: 36.0.1 - Hello contact tabs may not be visible (1137141)
  • Fixed: 36.0.1 - Accept hostnames that include an underscore character ("_") (1136616)
  • Fixed: 36.0.1 - WebGL may use significant memory with Canvas2d (1137251)
  • Fixed: 36.0.1 - Option -remote has been restored (1080319)
  • Fixed: 36.0.1 - Fix a top crash
  • New: Pinned tiles on the new tab page can be synced
  • New: Support for the full HTTP/2 protocol. HTTP/2 enables a faster, more scalable, and more responsive web.
  • New: Locale added: Uzbek (uz)
  • Changed: -remote option removed
  • Changed: No longer accept insecure RC4 ciphers whenever possible
  • Changed: Phasing out Certificates with 1024-bit RSA Keys
  • Changed: Shut down hangs will now show the crash reporter before exiting the program
  • Changed: Add-on Compatibility
  • HTML5: Support for the ECMAScript 6 Symbol data type added
  • HTML5: unicode-range CSS descriptor implemented
  • HTML5: CSSOM-View scroll behavior implemented allowing smooth scrolling of content without custom libraries
  • HTML5: object-fit and object-position implemented. Defines how and where the content of a replaced element is displayed
  • HTML5: isolation CSS property implemented. Create a new stacking context to isolate groups of boxes to control which blend together
  • HTML5: CSS3 will-change property implemented. Hints the browser of elements that will be modified. The browser will perform some performance optimization for these
  • HTML5: Improved ES6 generators for better performance
  • HTML5: Changed JavaScript 'const' semantics to conform better to the ES6 specification. The const declaration is now block-scoped and requires an initializer. It also can not be redeclared anymore.
  • Developer: Eval sources now appear in the Debugger. Debug JavaScript code that is evaluated dynamically, either as a string passed to eval() or as a string passed to the Function constructor
  • Developer: DOM Promises inspection
  • Developer: Inspector: More paste options in markup view
  • Fixed: Various security fixes
  • Fixed: CSS gradients work on premultiplied colors
  • Fixed: Fix some unexpected logout from Facebook or Google after restart
  • Known Issues
  • unresolved: Style Editor: Extra white space appearing above the editor for a sourcemapped scss file (1128747)
  • unresolved: For users who removed the Share & Hello buttons, this new version brings them back unexpectedly (1136300)
  • unresolved: Firefox Hello does not work for link generators if there is no camera installed (1106941)


Changes for v35.0.1 - v36.0

  • What’s New
  • New: Pinned tiles on the new tab page can be synced
  • New: Support for the full HTTP/2 protocol. HTTP/2 enables a faster, more scalable, and more responsive web.
  • New: Locale added: Uzbek (uz)
  • New: New preferences implementation enabled for the first half of the beta cycle
  • Changed: The Flash protected-mode sandbox is disabled on Windows, to evaluate the stability impact of protected mode
  • Changed: -remote option removed
  • Changed: No longer accept insecure RC4 ciphers whenever possible
  • Changed: Phasing out Certificates with 1024-bit RSA Keys
  • Changed: Shut down hangs will now show the crash reporter before exiting the program
  • Changed: Add-on Compatibility
  • HTML5: Implemented a subset of the Media Source Extensions (MSE) API to allow native HTML5 playback on YouTube.
  • HTML5: Support for the ECMAScript 6 Symbol data type added
  • HTML5: unicode-range CSS descriptor implemented
  • HTML5: CSSOM-View scroll behavior implemented allowing smooth scrolling of content without custom libraries
  • HTML5: object-fit and object-position implemented. Defines how and where the content of a replaced element is displayed
  • HTML5: isolation CSS property implemented. Create a new stacking context to isolate groups of boxes to control which blend together
  • HTML5: CSS3 will-change property implemented. Hints the browser of elements that will be modified. The browser will perform some performance optimization for these
  • HTML5: Changed JavaScript 'const' semantics to conform better to the ES6 specification. The const declaration is now block-scoped and requires an initializer. It also can not be redeclared anymore.
  • HTML5: implemented for more privacy. Allows to control the content of the HTTP referer header.
  • HTML5: Improved ES6 generators for better performance
  • Developer: Eval sources now appear in the Debugger. Debug JavaScript code that is evaluated dynamically, either as a string passed to eval() or as a string passed to the Function constructor
  • Developer: DOM Promises inspection
  • Developer: Inspector: More paste options in markup view
  • Fixed: CSS gradients work on premultiplied colors
  • Fixed: Fix some unexpected logout from Facebook or Google after restart


Changes for v35.0 - v35.0.1

  • What’s New
  • Fixed: 35.0.1 - With the Enhanced Steam extension, Firefox could crash (1123732)
  • Fixed: 35.0.1 - Fix a potential startup crash (1122367)
  • Fixed: 35.0.1 - Kerberos authentication did not work with alias (1108971)
  • Fixed: 35.0.1 - SVG / CSS animation had a regression causing rendering issues on websites like openstreemap.org (1083079)
  • Fixed: 35.0.1 - On Godaddy webmail, Firefox could crash (1113121)
  • Fixed: 35.0.1 - document.baseURI did not get updated to document.location after base tag was removed from DOM for site with a CSP (1121857)
  • Fixed: 35.0.1 - With a Right-to-left (RTL) version of Firefox, the text selection could be broken (1104036)
  • Fixed: 35.0.1 - CSP had a change in behavior with regard to case sensitivity resources loading (1122445)
  • New: Firefox Hello with new rooms-based conversations model
  • New: New search UI improved and enabled for more locales
  • New: Access the Firefox Marketplace from the Tools menu and optional toolbar button
  • New: Built-in support for H264 (MP4) on Mac OS X Snow Leopard (10.6) and newer through native APIs
  • New: Improved handling of dynamic styling changes to increase responsiveness
  • New: Use tiled rendering on OS X
  • New: Improved high quality image resizing performance
  • HTML5: Changed JavaScript 'let' semantics to conform better to the ES6 specification
  • HTML5: Resource Timing API implemented
  • HTML5: CSS filters enabled by default
  • HTML5: Added support for the CSS Font Loading API
  • Developer: Support for inspecting ::before and ::after pseudo elements
  • Developer: Computed view: Nodes matching the hovered selector are now highlighted
  • Developer: Network Monitor: New request/response headers view (more info)
  • Developer: Added support for the EXT_blend_minmax WebGL extension
  • Fixed: Various security fixes
  • Fixed: Show DOM Properties context menu item in inspector
  • Fixed: Reduced resource usage for scaled images
  • Fixed: PDF.js updated to version 1.0.907
  • Fixed: Non-HTTP(S) XHR now returns correct status code
  • Known Issues
  • unresolved: WebGL games might not display some textures (see bug 1113633)
  • unresolved: Sometimes images don't display when hovered over (see bug 1083113)
  • unresolved: Issues affecting RTL in Hello can be found here


Changes for v33.1.1 - v34.0.5

  • What’s New
  • New: Firefox Hello real-time communication client
  • New: Easily switch themes/personas directly in the Customizing mode
  • New: Wikipedia search now uses HTTPS for secure searching (en-US only)
  • New: Implementation of HTTP/2 (draft14) and ALPN
  • New: Recover from a locked Firefox process in the "Firefox is already running" dialog on Windows
  • HTML5: ECMAScript 6 WeakSet Implemented
  • HTML5: JavaScript Template Strings Implemented
  • HTML5: CSS3 Font variants and features control (e.g. kerning) implemented
  • HTML5: WebCrypto: RSA-OAEP, PBKDF2 and AES-KW support
  • HTML5: WebCrypto: wrapKey and unwrapKey implemented
  • HTML5: WebCrypto: Import/export of JWK-formatted keys
  • HTML5: matches() DOM API implemented (formerly mozMatchesSelector())
  • HTML5: Performance.now() for workers implemented
  • HTML5: WebCrypto: ECDH support
  • HTML5: Support for the ECMAScript 6 Symbol data type added
  • Developer: WebIDE: Create, edit, and test a new Web application from your browser
  • Developer: Highlight all nodes that match a given selector in the Style Editor and the Inspector's Rules panel
  • Developer: Improved User Interface of the Profiler
  • Developer: console.table function added to web console
  • Fixed: CSS transitions start correctly when started at the same time as changes to display, position, overflow, and similar properties
  • Known Issues
  • unresolved: Windows: On some combination of hardware and drivers, the main window could be black. In this case, update your graphics drivers (1083071). Resolved in v33.0.1


Changes for v33.1 - v33.1.1

  • What’s New
  • Fixed: 33.1.1 - Fixed startup crash (1021265)
  • New: Forget Button added
  • New: Enhanced Tiles
  • New: Privacy tour introduced
  • New: Adding DuckDuckGo as a search option
  • Known Issues
  • unresolved: PDF.js: With some images, wrong colors could show up. Affects a very small number of PDF
  • unresolved: Windows: Interface may be slow when typing or selecting text (1089183)
  • unresolved: Windows: On some combination of hardware and drivers, some flickering can happen


Changes for v33.0.3 - v33.1

  • What’s New
  • New: Forget Button added
  • New: Enhanced Tiles
  • New: Privacy tour introduced
  • New: Adding DuckDuckGo as a search option
  • Known Issues
  • unresolved: PDF.js: With some images, wrong colors could show up. Affects a very small number of PDF
  • unresolved: Windows: Interface may be slow when typing or selecting text (1089183)
  • unresolved: Windows: On some combination of hardware and drivers, some flickering can happen


Changes for v33.0.2 - v33.0.3

  • What’s New
  • Fixed: 33.0.3: Blacklisted graphics drivers that were causing black screens with OMTC enabled (see bug 1093863)
  • New: OpenH264 support (sandboxed)
  • New: Improved search experience through the location bar
  • New: Windows: OMTC enabled by default
  • New: Slimmer and faster JavaScript strings
  • New: Search suggestions on the Firefox Start (about:home) and new tab (about:newtab) pages
  • New: Support for connecting to HTTP proxy over HTTPS
  • New: New CSP (Content Security Policy) backend
  • New: Improved reliability of the session restoration
  • New: Azerbaijani [az] locale added
  • Changed: JSD (JavaScript Debugger Service) removed in favor of the Debugger interface
  • Changed: Proprietary window.crypto properties/functions removed
  • HTML5: DOMMatrix interface implemented
  • HTML5: @counter-style rule from CSS3 Counter Styles specification implemented
  • Developer: Cubic-bezier curves editor
  • Developer: Paint flashing for browser content repaints
  • Developer: Display which elements have listeners attached
  • Developer: New sidebar which displays a list of shortcuts to every @media rule in the current stylesheet
  • Developer: Editable @keyframes rules in the Rules section of the Inspector
  • Developer: CSS transform highlighter in the style-inspector
  • Fixed: 33.0.1: Firefox displays a black screen at start-up with certain graphics drivers
  • Fixed: Various security fixes
  • Fixed: 33.0.2: Fix a startup crash with some combination of hardware and drivers
  • Known Issues
  • unresolved: Fix incomplete downloads being marked as complete by detecting broken HTTP1.1 transfers (237623). Resolved in v33.0
  • unresolved: PDF.js: With some images, wrong colors could show up. Affects a very small number of PDF.
  • unresolved: Some certificate errors cannot be overridden (1042889)
  • unresolved: Windows: On some combination of hardware and drivers, the main window could be black. In this case, update your graphics drivers (1083071). Resolved in v33.0.1
  • unresolved: Windows: With Avast HTTPS scanning enabled, Firefox will not close correctly (1087674)
  • unresolved: Windows: Interface may be slow when typing or selecting text (1089183)


Changes for v33.0 - v33.0.1

  • What’s New
  • Fixed: 33.0.1: Firefox displays a black screen at start-up with certain graphics drivers
  • New: OpenH264 support (sandboxed)
  • New: Improved search experience through the location bar
  • New: Windows: OMTC enabled by default
  • New: Slimmer and faster JavaScript strings
  • New: Search suggestions on the Firefox Start (about:home) and new tab (about:newtab) pages
  • New: Support for connecting to HTTP proxy over HTTPS
  • New: New CSP (Content Security Policy) backend
  • New: Improved reliability of the session restoration
  • New: Azerbaijani [az] locale added
  • Changed: JSD (JavaScript Debugger Service) removed in favor of the Debugger interface
  • Changed: Proprietary window.crypto properties/functions removed
  • HTML5: DOMMatrix interface implemented
  • HTML5: @counter-style rule from CSS3 Counter Styles specification implemented
  • Developer: Cubic-bezier curves editor
  • Developer: Paint flashing for browser content repaints
  • Developer: Display which elements have listeners attached
  • Developer: New sidebar which displays a list of shortcuts to every @media rule in the current stylesheet
  • Developer: Editable @keyframes rules in the Rules section of the Inspector
  • Developer: CSS transform highlighter in the style-inspector
  • Fixed: Various security fixes
  • Known Issues
  • unresolved: Fix incomplete downloads being marked as complete by detecting broken HTTP1.1 transfers (237623). Resolved in v33.0
  • unresolved: PDF.js: With some images, wrong colors could show up. Affects a very small number of PDF
  • unresolved: Some certificate errors cannot be overridden (1042889)
  • unresolved: Windows: On some combination of hardware and drivers, the main window could be black. In this case, update your graphics drivers (1083071)


Changes for v32.0.2 - v32.0.3

  • What’s New
  • Fixed: 32.0.3: New security fixes can be found here: https://www.mozilla.org/security/known-vulnerabilities/firefox.html
  • New: New HTTP cache provides improved performance including crash recovery
  • New: Integration of generational garbage collection
  • New: Public key pinning support enabled
  • New: View historical use information for logins stored in password manager
  • New: Display the number of found items in the find toolbar
  • New: Easier back, forward, reload, and bookmarking through the context menu
  • New: Lower Sorbian [dsb] locale added
  • Changed: Removed and turned off trust bit for some 1024-bit root certificates
  • Changed: Performance improvements to Password Manager and Add-on Manager
  • HTML5: drawFocusIfNeeded enabled by default
  • HTML5: ECMAScript 6 built-in method Array#copyWithin implemented
  • HTML5: CSS position:sticky enabled by default
  • HTML5: mix-blend-mode enabled by default
  • HTML5: New Array built-in: Array.from()
  • HTML5: navigator.languages property and languagechange event implemented
  • HTML5: Vibration API updated to latest W3C spec
  • HTML5: CSS box-decoration-break replaces -moz-background-inline-policy
  • HTML5: box-decoration-break enabled by default
  • Developer: HiDPI support in Developer Tools UI
  • Developer: Inspector button moved to the top left
  • Developer: Hidden nodes displayed differently in the markup-view
  • Developer: New Web Audio Editor
  • Developer: Code completion and inline documentation added to Scratchpad
  • Fixed: 32.0.2 - Corrupt installations cause Firefox to crash on update
  • Fixed: 32.0.1 - Stability issues for computers with multiple graphics cards
  • Fixed: 32.0.1 - Mixed content icon may be incorrectly displayed instead of lock icon for SSL sites
  • Fixed: 32.0.1 - WebRTC: setRemoteDescription() silently fails if no success callback is specified
  • Fixed: Various security fixes
  • Fixed: Mac OS X: cmd-L does not open a new window when no window is available
  • Fixed: Text Rendering Issues on Windows 7 with Platform Update KB2670838 (MSIE 10 Prerequisite) or on Windows 8.1
  • Known Issues
  • unresolved: Assistive technologies may cause performance issues on Windows XP


Changes for v32.0.1 - v32.0.2

  • What’s New
  • Fixed: 32.0.2 - Corrupt installations cause Firefox to crash on update
  • New: New HTTP cache provides improved performance including crash recovery
  • New: Integration of generational garbage collection
  • New: Public key pinning support enabled
  • New: View historical use information for logins stored in password manager
  • New: Display the number of found items in the find toolbar
  • New: Easier back, forward, reload, and bookmarking through the context menu
  • New: Lower Sorbian [dsb] locale added
  • Changed: Removed and turned off trust bit for some 1024-bit root certificates
  • Changed: Performance improvements to Password Manager and Add-on Manager
  • HTML5: drawFocusIfNeeded enabled by default
  • HTML5: ECMAScript 6 built-in method Array#copyWithin implemented
  • HTML5: CSS position:sticky enabled by default
  • HTML5: mix-blend-mode enabled by default
  • HTML5: New Array built-in: Array.from()
  • HTML5: navigator.languages property and languagechange event implemented
  • HTML5: Vibration API updated to latest W3C spec
  • HTML5: CSS box-decoration-break replaces -moz-background-inline-policy
  • HTML5: box-decoration-break enabled by default
  • Developer: HiDPI support in Developer Tools UI
  • Developer: Inspector button moved to the top left
  • Developer: Hidden nodes displayed differently in the markup-view
  • Developer: New Web Audio Editor
  • Developer: Code completion and inline documentation added to Scratchpad
  • Fixed: 32.0.1 - Stability issues for computers with multiple graphics cards
  • Fixed: 32.0.1 - Mixed content icon may be incorrectly displayed instead of lock icon for SSL sites
  • Fixed: 32.0.1 - WebRTC: setRemoteDescription() silently fails if no success callback is specified
  • Fixed: Various security fixes
  • Fixed: Mac OS X: cmd-L does not open a new window when no window is available
  • Fixed: Text Rendering Issues on Windows 7 with Platform Update KB2670838 (MSIE 10 Prerequisite) or on Windows 8.1
  • Known Issues
  • unresolved: Assistive technologies may cause performance issues on Windows XP


Changes for v32.0 - v32.0.1

  • What’s New
  • Fixed: 32.0.1 - Start-up crash when using switchable Intel+ATI graphics cards
  • Fixed: 32.0.1 - Mixed content icon may be incorrectly displayed instead of lock icon for SSL sites
  • Fixed: 32.0.1 - WebRTC: setRemoteDescription() silently fails if no success callback is specified
  • New: New HTTP cache provides improved performance including crash recovery
  • New: Integration of generational garbage collection
  • New: Public key pinning support enabled
  • New: View historical use information for logins stored in password manager
  • New: Display the number of found items in the find toolbar
  • New: Easier back, forward, reload, and bookmarking through the context menu
  • New: Lower Sorbian [dsb] locale added
  • Changed: Removed and turned off trust bit for some 1024-bit root certificates
  • Changed: Performance improvements to Password Manager and Add-on Manager
  • HTML5: drawFocusIfNeeded enabled by default
  • HTML5: ECMAScript 6 built-in method Array#copyWithin implemented
  • HTML5: CSS position:sticky enabled by default
  • HTML5: mix-blend-mode enabled by default
  • HTML5: New Array built-in: Array.from()
  • HTML5: navigator.languages property and languagechange event implemented
  • HTML5: Vibration API updated to latest W3C spec
  • HTML5: CSS box-decoration-break replaces -moz-background-inline-policy
  • HTML5: box-decoration-break enabled by default
  • Developer: HiDPI support in Developer Tools UI
  • Developer: Inspector button moved to the top left
  • Developer: Hidden nodes displayed differently in the markup-view
  • Developer: New Web Audio Editor
  • Developer: Code completion and inline documentation added to Scratchpad
  • Fixed: Various security fixes
  • Fixed: Mac OS X: cmd-L does not open a new window when no window is available
  • Fixed: Text Rendering Issues on Windows 7 with Platform Update KB2670838 (MSIE 10 Prerequisite) or on Windows 8.1
  • Known Issues
  • unresolved: Assistive technologies may cause performance issues on Windows XP


Changes for v30.0 - v31.0

  • What’s New
  • New: Add the search field to the new tab page
  • New: mozilla::pkix as default certificate verifier (learn more)
  • New: OdinMonkey: Use backtracking allocator for asm.js style code
  • New: Integration of generational garbage collection
  • New: Partial implementation of the OpenType MATH table (section 6.3.6) see documentation about mathematical fonts and the MathML Torture Test for details
  • New: audio/video .ogg and .pdf files handled by Firefox if no application specified (Windows only)
  • Changed: Removal of the CAPS infrastructure for specifying site-specific permissions (via capability.policy.* preferences). Most notably, attempts to use this functionality to grant access to the clipboard will no longer work. The sole exception is the checkloaduri permission, which may still be used as before to allow sites to load file:// URIs.
  • HTML5: WebVTT implemented and enabled (learn more)
  • HTML5: CSS3 variables implemented (learn more)
  • Developer: Developer Tools: Add-on Debugger (learn more)
  • Developer: Developer Tools: Canvas Debugger (learn more)
  • Developer: New Array built-in: Array.prototype.fill() (learn more)
  • Developer: New Object built-in: Object.setPrototypeOf() (learn more)
  • Developer: CSP 1.1 nonce-source and hash-source enabled by default
  • Developer: Developer Tools: Eyedropper tool added to the color picker (learn more)
  • Developer: Developer Tools: Editable Box Model (learn more)
  • Developer: Developer Tools: Code Editor improvements (learn more)
  • Developer: Developer Tools: Console stack traces (learn more)
  • Developer: Developer Tools: Copy as cURL (learn more)
  • Developer: Developer Tools: Styled console logs (learn more)
  • Developer: navigator.sendBeacon enabled by default (learn more)
  • Developer: Dialogs spawned from the onbeforeunload event no longer block access to the rest of the browser
  • Fixed: Search for partially selected link text from context menu (985824)
  • Known Issues
  • unresolved: Slow shut downs lead to 'Firefox is already running' warning (see 966469 and 985655)
  • unresolved: Without affecting security, after restoring your session, Extended Validation Certificates might not display (See 995801). Resolved in v31.0a2
  • unresolved: Mac OS X and Windows: Citrix Receiver no longer works. As a workaround, mark the plugin as Always Enable in the addon manager (1025627)
  • unresolved: GNU/Linux and Windows XP: Google Maps Street View displays a black screen (1034593). Resolved in v32.0a2
  • unresolved: Mac OS X: cmd-L no longer opens a new window when no window is available (1008793). Resolved in v32.0a2


Changes for v29.0.1 - v30.0

  • What’s New
  • New: Support for GStreamer 1.0
  • New: Mac OS X command-E sets find term to selected text
  • New: Sidebar button gives easier access to social, bookmark, & history sidebars
  • Changed: Disallow calling WebIDL constructors as functions on the web
  • Developer: With the exception of those bundled inside an extension or ones that are whitelisted, plugins will no longer be activated by default (see blog post)
  • Developer: Fixes to box-shadow and other visual overflow (see bug 480888)
  • Developer: Mute and volume available per window when using WebAudio
  • Developer: background-blend-mode enabled by default
  • Developer: Use of line-height allowed for
  • Developer: ES6 array and generator comprehensions implemented (read docs for more details)
  • Developer: Error stack now contains column number
  • Developer: Support for alpha option in canvas context options (feature description)
  • Fixed: Ignore autocomplete="off" when offering to save passwords via the password manager (see 956906)
  • Fixed: TypedArrays don't support new named properties (see 695438)
  • Known Issues
  • unresolved: Mac OS X: cmd-L no longer opens a new window when no window is available (1008793). Resolved in v32.0a2
  • unresolved: Without affecting security, after restoring your session, Extended Validation Certificates might not display (See 995801). Resolved in v31.0a2
  • unresolved: Slow shut downs lead to 'Firefox is already running' warning (see 966469 and 985655)
  • unresolved: Text Rendering Issues on Windows 7 with Platform Update KB2670838 (MSIE 10 Prerequisite) or on Windows 8.1 has a workaround (see 812695)
  • unresolved: Exit is not always completed when "clear history when Firefox closes" is enabled (1005487)


Changes for v28.0 - v29.0

  • What’s New
  • New: A set of new improvements to the Firefox user interface (learn more).
  • New: An interactive onboarding tour to guide users through new interface changes
  • New: A redesigned and improved customization mode
  • New: The ability to set up Firefox Sync by creating a Firefox account (learn more)
  • New: Gamepad API finalized and enabled (learn more)
  • New: Malay [ma] locale added
  • Changed: navigator.plugins is no longer enumerable, for user privacy
  • Changed: Clicking on a W3C Web Notification will switch to the originating tab
  • Developer: 'box-sizing' (dropping the -moz- prefix) implemented (learn more)
  • Developer: Console object available in Web Workers (learn more)
  • Developer: Promises enabled by default (learn more)
  • Developer: SharedWorker enabled by default
  • Developer: implemented and enabled
  • Developer: implemented and enabled
  • Developer: Enabled ECMAScript Internationalization API
  • Developer: Add-on bar has been removed, content moved to navigation bar
  • Known Issues
  • unresolved: Text Rendering Issues on Windows 7 with Platform Update KB2670838 (MSIE 10 Prerequisite) or on Windows 8.1 has a workaround (see 812695)
  • unresolved: Echo cancellation on apprtc.appspot.com fails (974537)


Changes for v27.0.1 - v28.0

  • What’s New
  • NEW: Firefox for Windows 8 touch preview available (see blog post)
  • NEW: Gamepad API finalized and enabled (learn more)
  • NEW: Mac OS X: Notification Center support for web notifications
  • NEW: Volume control for HTML5 audio/video
  • NEW: Support for Opus in WebM
  • NEW: VP9 video decoding implemented
  • CHANGED: Removed support for spdy/2
  • DEVELOPER: Support for MathML 2.0 'mathvariant' attribute
  • DEVELOPER: Background thread hang reporting
  • DEVELOPER: implemented and enabled
  • DEVELOPER: Support for multi-line flexbox in layout
  • Known Issues
  • Unresolved: Text Rendering Issues on Windows 7 with Platform Update KB2670838 (MSIE 10 Prerequisite) or on Windows 8.1 has a workaround (see 812695)


Changes for v27.0 - v27.0.1

  • What’s New
  • FIXED: 27.0.1 - Fixed stability issues with Greasemonkey and other JS that used ClearTimeoutOrInterval
  • FIXED: 27.0.1 - JS math correctness issue (bug 941381
  • NEW: You can now run more than one service at a time with Firefox SocialAPI, allowing you to receive notifications, chat and more from multiple integrated services
  • CHANGED: Enabled TLS 1.1 (RFC 4346) and TLS 1.2 (RFC 5246) by default
  • CHANGED: Added support for SPDY 3.1 protocol
  • DEVELOPER: Ability to reset style sheets using 'all:unset'
  • DEVELOPER: You can now choose to deobfuscate javascript in the debugger (see 762761)
  • DEVELOPER: Added support for scrolled fieldsets (see 261037)
  • DEVELOPER: Implemented allow-popups directive for iframe sandbox, enabling increased security (see 766282)
  • DEVELOPER: CSS cursor keywords -moz-grab and -moz-grabbing have been unprefixed (see 880672)
  • DEVELOPER: Added support for ES6 generators in SpiderMonkey (see blog post)
  • DEVELOPER: Implemented support for mathematical function Math.hypot() in ES6 (see 896264)
  • HTML5: Dashed line support on Canvas (see 768067)
  • FIXED: Get Azure/Skia content rendering working on Linux (see 740200)
  • FIXED: Various security fixes
  • Known Issues
  • Unresolved: Moving Firefox to background while playing a flash video in full screen mode and bring it back to view will freeze the app (see 809055)
  • Unresolved: Text Rendering Issues on Windows 7 with Platform Update KB2670838 (MSIE 10 Prerequisite) or on Windows 8.1 has a workaround (see 812695)


Changes for v25.0.1 - v26.0

  • NEW All Java plug-ins are defaulted to 'click to play'
  • NEW Password manager now supports script-generated password fields
  • NEW Updates can now be performed by Windows users without write permissions to Firefox install directory (requires Mozilla Maintenance Service)
  • NEW Support for H.264 on Linux if the appropriate gstreamer plug-ins are installed
  • CHANGED Support for MP3 decoding on Windows XP, completing MP3 support across Windows OS versions
  • CHANGED CSP implementation now supports multiple policies, including the case of both an enforced and Report-Only policy, per the spec
  • DEVELOPER Social API now supports Social Bookmarking for multiple providers through its SocialMarks functionality (see MDN docs)
  • DEVELOPER Math.ToFloat32 takes a JS value and converts it to a Float32, whenever possible
  • DEVELOPER There is no longer a prompt when websites use appcache
  • DEVELOPER Support for the CSS image orientation property
  • DEVELOPER New App Manager allows you to deploy and debug HTML5 webapps on Firefox OS phones and the Firefox OS Simulator
  • DEVELOPER IndexedDB can now be used as a "optimistic" storage area so it doesn't require any prompts and data is stored in a pool with LRU eviction policy, in short temporary storage
  • FIXED When displaying a standalone image, Firefox matches the EXIF orientation information contained within the JPEG image (298619)
  • FIXED Text Rendering Issues on Windows 7 with Platform Update KB2670838 (MSIE 10 Prerequisite) or on Windows 8.1 (812695)
  • FIXED Improved page load times due to no longer decoding images that aren't visible (847223)
  • FIXED AudioToolbox MP3 backend for OSX (914479)
  • FIXED Various security fixes


Changes for v25.0 - v25.0.1

  • What’s New
  • FIXED: 25.0.1: New security fixes can be found here
  • FIXED: 25.0.1: Pages sometimes wouldn't load without first moving the cursor
  • NEW: Web Audio support
  • NEW: The find bar is no longer shared between tabs
  • CHANGED: If away from Firefox for months, you now will be offered the option to reset it to its default state while preserving your essential information
  • CHANGED: Resetting Firefox no longer clears your browsing session
  • DEVELOPER: CSS3 background-attachment:local support to control background scrolling
  • DEVELOPER: Many new ES6 functions implemented
  • HTML5: iframe document content can now be specified inline
  • FIXED: Blank or missing page thumbnails when opening a new tab


Changes for v24.0 - v25.0

  • NEW: The find bar is no longer shared between tabs
  • CHANGED: If away from Firefox for months, you now will be offered the option to migrate another browser's history and settings
  • CHANGED: Resetting Firefox no longer clears your browsing session
  • DEVELOPER: CSS3 background-attachment:local support to control background scrolling
  • DEVELOPER: Many new ES6 functions implemented
  • HTML5: iframe document content can now be specified inline


Changes for v24.0 Beta 7 - v24.0

  • NEW Support for new scrollbar style in Mac OS X 10.7 and newer
  • NEW Implemented Close tabs to the right
  • NEW Social: Ability to tear-off chat windows to view separately by simply dragging them out
  • CHANGED Accessibility related improvements on using pinned tabs (see 577727)
  • CHANGED Removed support for Revocation Lists feature (see 867465)
  • CHANGED Performance improvements on New Tab Page loads (see 791670)
  • DEVELOPER Major SVG rendering improvements around Image tiling and scaling (see 600207 )
  • DEVELOPER Improved and unified Browser console for enhanced debugging experience, replacing existing Error console
  • DEVELOPER Removed support for sherlock files that are loaded from application or profile directory
  • FIXED Replace fixed-ratio audio resampler in webrtc.org capture code with Speex resampler and eliminate pseudo-44000Hz rate ( see 886886)


Changes for v22.0 - v23.0

  • What’s New
  • NEW: Mixed content blocking enabled to protects users from man-in-the-middle attacks and eavesdroppers on HTTPS pages (learn more)
  • NEW: Options panel created for Web Developer Toolbox
  • CHANGED: "Enable JavaScript" preference checkbox has been removed and user-set values will be reset to the default
  • CHANGED: Updated Firefox Logo
  • CHANGED: Improved about:memory's functional UI
  • CHANGED: Simplified interface for notifications of plugin installation
  • CHANGED: Enabled DXVA2 on Windows Vista+ to accelerate H.264 video decoding
  • CHANGED: Users can now switch to a new search provider across the entire browser
  • CHANGED: CSP policies using the standard syntax and semantics will now be enforced
  • CHANGED: rendering improvements (see bug 838675)
  • CHANGED: Replace fixed-ratio audio resampler in webrtc.org capture code with Speex resampler and eliminate pseudo-44000Hz rate
  • CHANGED: "Load images automatically" and Always show the tab bar" checkboxes removed from preferences and reset to defaults
  • DEVELOPER: HTML5 form control implemented
  • DEVELOPER: Write more accessible pages on touch interfaces with new ARIA role for key buttons
  • DEVELOPER: Social share functionality
  • DEVELOPER: Added unprefixed requestAnimationFrame
  • DEVELOPER: Implemented a global browser console
  • DEVELOPER: Dropped blink effect from text-decoration: blink; and completely removed element
  • DEVELOPER: New feature in toolbox: Network Monitor
  • FIXED: Various security fixes
  • Known Issues
  • Unresolved: Moving Firefox to background while playing a flash video in full screen mode and bring it back to view will freeze the app (see 809055)
  • Unresolved: If you try to start Firefox using a locked profile, it will crash (see 573369)


Changes for v22.0 - v23.0 Beta 1

  • What’s New
  • NEW: Support for new scrollbar style in Mac OS X 10.7 and newer
  • NEW: Mixed content blocking enabled to protects users from man-in-the-middle attacks and eavesdroppers on HTTPS pages (learn more)
  • CHANGED: Improved about:memory's functional UI
  • CHANGED: Enabled DXVA2 on Windows Vista+ to accelerate H.264 video decoding
  • CHANGED: Updated Firefox Logo
  • CHANGED: "Load images automatically", "Enable JavaScript", and Always show the tab bar" checkboxes removed from preferences
  • CHANGED: Simplified interface for notifications of plugin installation
  • CHANGED: Users can now switch to a new search provider across the entire browser
  • CHANGED: CSP policies using the standard syntax and semantics will now be enforced
  • DEVELOPER: Implemented a global browser console
  • DEVELOPER: Social share functionality
  • DEVELOPER: HTML5 form control implemented
  • DEVELOPER: Write more accessible pages on touch interfaces with new ARIA role for key buttons
  • DEVELOPER: Added unprefixed requestAnimationFrame
  • DEVELOPER: New feature in toolbox: Nework Monitor
  • DEVELOPER: Dropped blink effect from text-decoration: blink; and completely removed element
  • Known Issues
  • Unresolved: If you try to start Firefox using a locked profile, it will crash (see 573369)


Changes for v22.0 Beta 1 - v22.0

  • What’s New
  • NEW: Windows: Firefox now follows display scaling options to render text larger on high-res displays
  • NEW: WebRTC is now enabled by default!
  • NEW: Mac OS X: Download progress in Dock application icon
  • NEW: HTML5 audio/video playback rate can now be changed
  • NEW: Social services management implemented in Add-ons Manager
  • NEW: asm.js optimizations (OdinMonkey) enabled for major performance improvements
  • CHANGED: Improved WebGL rendering performance through asynchronous canvas updates
  • CHANGED: Plain text files displayed within Firefox will now word-wrap
  • CHANGED: For user security, the |Components| object is no longer accessible from web content
  • CHANGED: Improved memory usage and display time when rendering images
  • CHANGED: Pointer Lock API can now be used outside of fullscreen
  • DEVELOPER: CSS3 Flexbox implemented and enabled by default
  • DEVELOPER: New Web Notifications API implemented
  • DEVELOPER: Added clipboardData API for JavaScript access to a user's clipboard
  • DEVELOPER: New built-in font inspector
  • HTML5: New HTML5 and
  • FIXED: Scrolling using some high-resolution-scroll aware touchpads feels slow (829952)
  • Known Issues
  • Unresolved: If you try to start Firefox using a locked profile, it will crash (see 573369)
  • Unresolved: Download statusbar add-on continues downloading files from Normal Browsing, when switching to Private Browsing (see 853463)


Changes for v20.0.1 - v21.0

  • NEW The Social API now supports multiple providers
  • NEW Enhanced three-state UI for Do Not Track (DNT)
  • NEW Firefox will suggest how to improve your application startup time if needed
  • NEW Preliminary implementation of Firefox Health Report
  • CHANGED Ability to restore removed thumbnails on New Tab Page
  • CHANGED CSS -moz-user-select:none selection changed to improve compatibility with -webkit-user-select:none (bug 816298)
  • CHANGED Graphics related performance improvements (bug 809821)
  • CHANGED Removed E4X support from Spidermonkey
  • DEVELOPER Implemented Remote Profiling
  • DEVELOPER Integrated add-on SDK loader and API libraries into Firefox
  • HTML5 Added support for
    element
  • HTML5 Implemented scoped stylesheets
  • FIXED Some function keys may not work when pressed (833719)
  • FIXED Browsing and Download history clearing needs unification to avoid confusion on clearing download history (847627)
  • FIXED 21.0: Security fixes can be found here


Changes for v20.0 - v20.0.1

  • FIXED 20.0.1 - Windows-only update to handle issues around handling UNC paths (see bug 846848)
  • NEW Per-window Private Browsing. Learn more.
  • NEW New download experience. Learn more.
  • NEW Ability to close hanging plugins, without the browser hanging
  • CHANGED Continued performance improvements around common browser tasks (page loads, downloads, shutdown, etc.)
  • DEVELOPER Continued implementation of draft ECMAScript 6 - clear() and Math.imul
  • DEVELOPER New JavaScript Profiler tool
  • HTML5 getUserMedia implemented for web access to the user's camera and microphone (with user permission)
  • HTML5 now supports blend modes
  • HTML5 Various
  • FIXED 20.0.1: Security fixes can be found here
  • FIXED Details button on Crash Reporter (793972)
  • FIXED Unity plugin doesn't display in HiDPI mode (829284)


Changes for v19.0.2 - v20.0

  • FIXED
  • 20.0: Security fixes can be found here
  • NEW
  • Per-window Private Browsing. Learn more.
  • NEW
  • New download experience. Learn more.
  • NEW
  • Ability to close hanging plugins, without the browser hanging
  • CHANGED
  • Continued performance improvements around common browser tasks (page loads, downloads, shutdown, etc.)
  • DEVELOPER
  • Continued implementation of draft ECMAScript 6 - clear() and Math.imul
  • DEVELOPER
  • New JavaScript Profiler tool
  • HTML5
  • getUserMedia implemented for web access to the user's camera and microphone (with user permission)
  • HTML5
  • now supports blend modes
  • HTML5
  • Various
  • FIXED
  • Details button on Crash Reporter (793972)
  • FIXED
  • Unity plugin doesn't display in HiDPI mode (829284)


Changes for v19.0.1 - v19.0.2

  • What’s New
  • FIXED. 19.0.2: Security-driven release, see details in the associated security advisory
  • FIXED. 19.0.1 (Windows 8 only): Fixed stability issue for some AMD Radeon HD graphics cards
  • NEW. Built-in PDF viewer
  • CHANGED. Canvas elements can export their content as an image blob using canvas.toBlob()
  • CHANGED. Startup performance improvements (bugs 715402 and 756313)
  • DEVELOPER. Debugger now supports pausing on exceptions and hiding non-enumerable properties
  • DEVELOPER. Remote Web Console is available for connecting to Firefox on Android or Firefox OS (experimental, set devtools.debugger.remote-enabled to true)
  • DEVELOPER. There is now a Browser Debugger available for add-on and browser developers (experimental, set devtools.chrome.enabled to true)
  • DEVELOPER. Web Console CSS links now open in the Style Editor
  • HTML5. CSS @page is now supported
  • HTML5. CSS viewport-percentage length units implemented (vh, vw, vmin and vmax)
  • HTML5. CSS text-transform now supports full-width
  • FIXED. Certain valid WebGL drawing operations are incorrectly rejected, leaving incomplete rendering in affected pages (825205)
  • FIXED. Starting Firefox with -private flag incorrectly claims you are not in Private Browsing mode (802274)
  • FIXED. Plugins stop rendering when the top half of the plugin is scrolled off the top of the page, in HiDPI mode (825734)
  • Known Issues
  • Unresolved. If you try to start Firefox using a locked profile, it will crash (see 573369)
  • Unresolved. For some users, scrolling in the main GMail window will be slower than usual (see 579260)
  • Unresolved. Mootools 1.2.x incompatible with Firefox 18 and newer.Fixed in Mootools 1.3 and newer (see 789036)
  • Unresolved. Some function keys may not work when pressed (see 833719)


Changes for v19.0 - v19.0.1

  • What’s New
  • FIXED. Windows 8 only: Fixed stability issue for some AMD Radeon HD graphics cards
  • NEW. Built-in PDF viewer
  • CHANGED. Canvas elements can export their content as an image blob using canvas.toBlob()
  • CHANGED. Startup performance improvements (bugs 715402 and 756313)
  • DEVELOPER. ebugger now supports pausing on exceptions and hiding non-enumerable properties
  • DEVELOPER. Remote Web Console is available for connecting to Firefox on Android or Firefox OS (experimental, set devtools.debugger.remote-enabled to true)
  • DEVELOPER. There is now a Browser Debugger available for add-on and browser developers (experimental, set devtools.chrome.enabled to true)
  • DEVELOPER. Web Console CSS links now open in the Style Editor
  • HTML5. CSS @page is now supported
  • HTML5. CSS viewport-percentage length units implemented (vh, vw, vmin and vmax)
  • HTML5. CSS text-transform now supports full-width
  • FIXED. Certain valid WebGL drawing operations are incorrectly rejected, leaving incomplete rendering in affected pages (825205)
  • FIXED. Starting Firefox with -private flag incorrectly claims you are not in Private Browsing mode (802274)
  • FIXED. Plugins stop rendering when the top half of the plugin is scrolled off the top of the page, in HiDPI mode (825734)
  • Known Issues
  • Unresolved. If you try to start Firefox using a locked profile, it will crash (see 573369)
  • Unresolved. For some users, scrolling in the main GMail window will be slower than usual (see 579260)
  • Unresolved. Mootools 1.2.x incompatible with Firefox 18 and newer.Fixed in Mootools 1.3 and newer (see 789036)
  • Unresolved. Some function keys may not work when pressed (see 833719)


Changes for v18.0.2 - v19.0

  • What’s New
  • NEW. Built-in PDF viewer
  • CHANGED. Canvas elements can export their content as an image blob using canvas.toBlob()
  • CHANGED. Startup performance improvements (bugs 715402 and 756313)
  • DEVELOPER. Debugger now supports pausing on exceptions and hiding non-enumerable properties
  • DEVELOPER. Remote Web Console is available for connecting to Firefox on Android or Firefox OS (experimental, set devtools.debugger.remote-enabled to true)
  • DEVELOPER. There is now a Browser Debugger available for add-on and browser developers (experimental, set devtools.chrome.enabled to true)
  • DEVELOPER. Web Console CSS links now open in the Style Editor
  • HTML5. CSS @page is now supported
  • HTML5. CSS viewport-percentage length units implemented (vh, vw, vmin and vmax)
  • HTML5. CSS text-transform now supports full-width
  • FIXED. Certain valid WebGL drawing operations are incorrectly rejected, leaving incomplete rendering in affected pages (825205)
  • FIXED. Starting Firefox with -private flag incorrectly claims you are not in Private Browsing mode (802274)
  • FIXED. Plugins stop rendering when the top half of the plugin is scrolled off the top of the page, in HiDPI mode (825734)
  • Known Issues
  • Unresolved. If you try to start Firefox using a locked profile, it will crash (see 573369)
  • Unresolved. For some users, scrolling in the main GMail window will be slower than usual (see 579260)
  • Unresolved. Mootools 1.2.x incompatible with Firefox 18 and newer.Fixed in Mootools 1.3 and newer (see 789036)
  • Unresolved. Some function keys may not work when pressed (see 833719)


Changes for v18.0.1 - v18.0.2

  • 18.0.2: Fix JavaScript related stability issues


Changes for v18.0 - v18.0.1

  • What’s New
  • FIXED 18.0.1: Problems involving HTTP Proxy Transactions (Associated bugs)
  • FIXED 18.0.1: Unity player crashes on Mac OS X (bug 828954)
  • FIXED 18.0.1: Disabled HIDPI support on external monitors to avoid rendering glitches (bug 814434)
  • NEW Faster JavaScript performance via IonMonkey compiler
  • NEW Support for Retina Display on OS X 10.7 and up
  • NEW Preliminary support for WebRTC
  • CHANGED Experience better image quality with our new HTML scaling algorithm
  • CHANGED Performance improvements around tab switching
  • DEVELOPER Support for new DOM property window.devicePixelRatio
  • DEVELOPER Improvement in startup time through smart handling of signed extension certificates
  • HTML5 Support for W3C touch events implemented, taking the place of MozTouch events
  • FIXED Disable insecure content loading on HTTPS pages (62178)
  • FIXED Improved responsiveness for users on proxies (769764)
  • Known Issues
  • Unresolved. If you try to start Firefox using a locked profile, it will crash (see 573369)
  • Unresolved. For some users, scrolling in the main GMail window will be slower than usual (see 579260)
  • Unresolved. Animated Personas or Themes now require a workaround. See this support page
  • Unresolved. Windows: The use of Microsoft's System Restore functionality shortly after updating Firefox may prevent future updates (see 730285)
  • Unresolved. Mootools 1.2.x incompatible with Firefox 18 and newer.Fixed in Mootools 1.3 and newer (see 789036)
  • Unresolved. Starting Firefox with -private flag incorrectly claims you are not in Private Browsing mode (see 802274)
  • Unresolved. Certain valid WebGL drawing operations are incorrectly rejected, leaving incomplete rendering in affected pages (see 825205)
  • Unresolved. Plugins stop rendering when the top half of the plugin is scrolled off the top of the page, in HiDPI mode (see 825734)


Changes for v17.0.1 - v18.0

  • NEW: Faster JavaScript performance via IonMonkey compiler
  • NEW: Support for Retina Display on OS X 10.7 and up
  • NEW: Preliminary support for WebRTC
  • CHANGED: Experience better image quality with our new HTML scaling algorithm
  • CHANGED: Performance improvements around tab switching
  • DEVELOPER: Support for new DOM property window.devicePixelRatio
  • DEVELOPER: Improvement in startup time through smart handling of signed extension certificates
  • HTML5: Support for W3C touch events implemented, taking the place of MozTouch events
  • FIXED: Disable insecure content loading on HTTPS pages (62178)
  • FIXED: Improved responsiveness for users on proxies (769764)


Changes for v17.0 Beta 6 - v17.0

  • What’s New
  • NEW. First revision of the Social API and support for Facebook Messenger
  • NEW. Click-to-play blocklisting implemented to prevent vulnerable plugin versions from running without the user's permission (see blog post)
  • CHANGED. Updated Awesome Bar experience with larger icons
  • CHANGED. Mac OS X 10.5 is no longer supported
  • DEVELOPER. JavaScript Maps and Sets are now iterable
  • DEVELOPER. SVG FillPaint and StrokePaint implemented
  • DEVELOPER. Improvements that make the Web Console, Debugger and Developer Toolbar faster and easier to use
  • DEVELOPER. New Markup panel in the Page Inspector allows easy editing of the DOM
  • HTML5. Sandbox attribute for iframes implemented, enabling increased security
  • FIXED. Over twenty performance improvements, including fixes around the New Tab page
  • FIXED. Pointer lock doesn't work in web apps (769150)
  • FIXED. Page scrolling on sites with fixed headers (780345)
  • Known Issues
  • Unresolved. If you try to start Firefox using a locked profile, it will crash (see 573369)
  • Unresolved. For some users, scrolling in the main GMail window will be slower than usual (see 579260)
  • Unresolved. Windows: The use of Microsoft's System Restore functionality shortly after updating Firefox may prevent future updates (see 730285)


Changes for v16.0.1 - v16.0.2

  • Critical: Vulnerability can be used to run attacker code and install software, requiring no user interaction beyond normal browsing.
  • High: Vulnerability can be used to gather sensitive data from sites in other windows or inject data or code into those sites, requiring no more than normal browsing actions.
  • Moderate: Vulnerabilities that would otherwise be High or Critical except they only work in uncommon non-default configurations or require the user to perform complicated and/or unlikely steps.
  • Low: Minor security vulnerabilities such as Denial of Service attacks, minor data leaks, or spoofs. (Undetectable spoofs of SSL indicia would have "High" impact because those are generally used to steal sensitive data intended for other sites.)


Changes for v16.0 - v16.0.1

  • FIXED: The vulnerability could allow a malicious site to potentially determine which websites users have visited and have access to the URL or URL parameters. At this time we have no indication that this vulnerability is currently being exploited in the wild.


Changes for v13.0.1 - v14.0.1

  • What’s New
  • NEW. Google searches now utilize HTTPS
  • NEW. Full screen support for Mac OS X Lion implemented
  • NEW. Plugins can now be configured to only load on click (requires an about:config change)
  • NEW. The Awesome Bar now auto-completes typed URLs
  • CHANGED. Improved site identity manager, to prevent spoofing of an SSL connection with favicons
  • DEVELOPER. Pointer Lock API implemented
  • DEVELOPER. New API to prevent your display from sleeping
  • DEVELOPER. New text-transform and font-variant CSS improvements for Turkic languages and Greek
  • FIXED. Various security fixes
  • FIXED. GIF animation can gets stuck when src and image size are changed (743598)
  • FIXED. OS X: nsCocoaWindow::ConstrainPosition uses wrong screen in multi-display setup (752149)
  • FIXED. CSS :hover regression when an element's class name is set by Javascript (758885)
  • Known Issues
  • Unresolved. If you try to start Firefox using a locked profile, it will crash (see 573369)
  • Unresolved. For some users, scrolling in the main GMail window will be slower than usual (see 579260)
  • Unresolved. Focus rings keep growing when repeatedly tabbing through elements (see 720987)
  • Unresolved. Windows: The use of Microsoft's System Restore functionality shortly after updating Firefox may prevent future updates (see 730285)


Changes for v13.0 - v13.0.1

  • Windows Messenger did not load in Hotmail, and the Hotmail inbox did not auto-update (764546, fixed in 13.0.1)
  • Hebrew text sometimes rendered incorrectly (756850, fixed in 13.0.1)
  • Flash 11.3 sometimes caused a crash on quit (747683, fixed in 13.0.1)
  • When opening a new tab, users are now presented with their most visited pages
  • The default home page now has quicker access to bookmarks, history, settings, and more
  • SPDY protocol now enabled by default for faster browsing on supported sites
  • Restored background tabs are not loaded by default for faster startup
  • Smooth scrolling is now enabled by default
  • 72 total improvements to Page Inspector, HTML panel, Style Inspector, Scratchpad and Style Editor
  • The column-fill CSS property has been implemented
  • Experimental support for ECMAScript 6 Map and Set objects has been implemented
  • Support for the CSS3 background-position property extended syntax has been added
  • The :invalid pseudo-class can now be applied to the element
  • The CSS turn unit is now supported
  • Various security fixes


Changes for v10.0.2 - v11.0

  • What?s New
  • NEW Firefox can now migrate your bookmarks, history, and cookies from Google Chrome
  • NEW With Sync enabled, add-ons can now be synchronized across your computers
  • NEW The CSS text-size-adjust property is now supported
  • HTML5 The outerHTML property is now supported on HTML elements
  • HTML5 View source syntax highlighting now uses the HTML5 parser (see bug 482921)
  • DEVELOPER The Style Editor for CSS editing is now available to web developers
  • DEVELOPER Web developers can now visualize a web page in 3D using the Page Inspector 3D View
  • DEVELOPER SPDY protocol support for faster page loads is now testable
  • DEVELOPER XMLHttpRequest now supports HTML parsing
  • DEVELOPER Files can now be stored in IndexedDB (see bug 661877)
  • DEVELOPER Websockets has now been unprefixed
  • FIXED Redesigned media controls for HTML5 video
  • FIXED Firefox notifications may not work properly with Growl 1.3 or later (691662)
  • Known Issues
  • Unresolved. Two-digit browser version numbers may cause a small number of website incompatibilities (see 690287)
  • Unresolved. If you try to start Firefox using a locked profile, it will crash (see 573369)
  • Unresolved. For some users, scrolling in the main GMail window will be slower than usual (see 579260)
  • Unresolved. Some synaptic touch pads are unable to vertical scroll (see 622410)
  • Unresolved. Under certain conditions, scrolling and text input may be jerky (see 711900)


Changes for v10.0.1 - v10.0.2

  • Fix a security issue:
  • Critical: Vulnerability can be used to run attacker code and install software, requiring no user interaction beyond normal browsing.
  • High: Vulnerability can be used to gather sensitive data from sites in other windows or inject data or code into those sites, requiring no more than normal browsing actions.
  • Moderate: Vulnerabilities that would otherwise be High or Critical except they only work in uncommon non-default configurations or require the user to perform complicated and/or unlikely steps.
  • Low: Minor security vulnerabilities such as Denial of Service attacks, minor data leaks, or spoofs. (Undetectable spoofs of SSL indicia would have "High" impact because those are generally used to steal sensitive data intended for other sites.)


Changes for v10.0 - v10.0.1

  • A top startup crash (bug is security locked because it's a crash)
  • Java applets cause text areas to hang (bug 718939)


Changes for v9.0.1 - v10.0

  • What?s New
  • NEW. The forward button is now hidden until you navigate back
  • NEW. Anti-Aliasing for WebGL is now implemented (see bug 615976)
  • NEW. Full Screen APIs allow you to build a web application that runs full screen (see the feature page)
  • NEW. CSS3 3D-Transforms are now supported (see bug 505115)
  • HTML5. New element for bi-directional text isolation, along with supporting CSS properties (see bugs 613149 and 662288)
  • DEVELOPER. Inspect tool with content highlighting, includes new CSS Style Inspector
  • DEVELOPER. We've added IndexedDB APIs to more closely match the specification
  • FIXED. Some users may experience a crash when moving bookmarks (681795)
  • Known Issues
  • Unresolved. Some synaptic touch pads are unable to vertical scroll
  • Unresolved. For some users, scrolling in the main GMail window will be slower than usual
  • Unresolved. If you try to start Firefox using a locked profile, it will crash
  • Unresolved. This version of Firefox will not work on Macintosh hardware with Power PC CPUs
  • Unresolved. Under certain conditions, scrolling and text input may be jerky
  • Resolved. Firefox notifications may not work properly with Growl 1.3 or later


Changes for v8.0 - v8.0.1

  • Fixed Mac OS X crash that occurred in certain instances when a Java Applet is loaded with Java SE 6 version 1.6.0_29 installed.
  • Fixed Windows startup crash caused by RoboForm versions older than 7.6.2.


Changes for v7.0 - v7.0.1

  • Fixed a rare issue where some users could find one or more of their add-ons hidden after a Firefox update


Changes for v6.0 - v6.0.1

  • Revoked the root certificate for DigiNotar due to fraudulent SSL certificate issuance (see bug 682927 and the security advisory)


Changes for v6.0 Beta 1 - v6.0 Beta 2

  • The latest version of Firefox Beta has the following changes:
  • The address bar now highlights the domain of the website you're visiting
  • Streamlined the look of the site identity block
  • Added support for the latest draft version of WebSockets with a prefixed API
  • Added support for EventSource / server-sent events
  • Added support for window.matchMedia
  • Added Scratchpad, an interactive JavaScript prototyping environment
  • Added a new Web Developer menu item and moved development-related items into it
  • Improved usability of the Web Console
  • Improved the discoverability of Firefox Sync
  • Reduced browser startup time when using Panorama


Changes for v5.0.1 - v6.0 Beta 1

  • The address bar now highlights the domain of the website you're visiting
  • Streamlined the look of the site identity block
  • Added support for the latest draft version of WebSockets with a prefixed API
  • Added support for EventSource / server-sent events
  • Added support for window.matchMedia
  • Added Scratchpad, an interactive JavaScript prototyping environment
  • Added a new Web Developer menu item and moved development-related items into it
  • Improved usability of the Web Console
  • Improved the discoverability of Firefox Sync
  • Reduced browser startup time when using Panorama


Changes for v5.0 - v5.0.1

  • Worked around an issue in Mac OS X 10.7 that could cause Firefox to crash
  • Worked around an issue caused by Apple's "Java for Mac OS X 10.6 Update 5" where the Java plugin would not be loaded


Changes for v4.0 - v4.0.1

  • Fixed several security issues.
  • Fixed several stability issues.


Changes for v4.0 RC 2 - v4.0

  • Firefox 4 is based on the Gecko 2.0 Web platform. This release features JavaScript execution speeds up to six times faster than the previous version, new capabilities for Web Developers and Add-on Developers such as hardware accelerated graphics and HTML5 technologies, and a completely revised user interface. Please read below for more detailed information about what's new in this version of the release, as well as the known issues.
  • Firefox 4 is available in over 80 languages
  • Uses JägerMonkey, a new, faster JavaScript engine that is up to six times faster than Firefox 3.6
  • Support for the Do Not Track ("DNT") header that allows users to opt-out of behavioural advertising
  • Firefox Sync is included by default, allowing you to securely synchronize between multiple computers and mobile devices
  • Certain graphics rendering operations are now hardware-accelerated using Direct3D 9 on Windows XP, Direct3D 10 on Windows Vista and 7, and OpenGL on Mac OS (OpenGL on Linux will be supported in the future)
  • Direct2D Hardware Acceleration is now on by default for Windows 7 users
  • WebGL is enabled on all platforms that have a capable graphics card with updated drivers
  • Native support for the HD HTML5 WebM video format, hardware accelerated where available
  • Firefox button has a new look for Windows Vista and Windows 7 users
  • Tabs are now on top by default on Windows, Mac OS X, and Linux
  • You can search for and switch to already open tabs in the Smart Location Bar
  • The stop and reload buttons have been merged into a single button on Windows, Mac OS X, and Linux
  • The Bookmarks Toolbar has been replaced with a Bookmarks Button by default (you can switch it back if you'd like)
  • Crash protection for Windows, Linux, and Mac OS X when there is a crash in the Adobe Flash, Apple Quicktime or Microsoft Silverlight plugins
  • You can turn any tab into an "App Tab" by right-clicking on it and selecting "Make into App Tab" from the context menu
  • The default homepage design has been refreshed
  • Overhaul of the bookmarks and history code, enabling faster bookmarking and startup performance
  • Per-compartment garbage collection is now enabled, reducing work done during complex animations
  • Additional polish for the Firefox Add-ons Manager
  • Improved web typography using OpenType with support for ligatures, kerning and font variants
  • Web developers can animate content using CSS Transitions
  • Responsiveness and scrolling improvements from the new retained layers layout system
  • HTML5 Forms API makes web based forms easier to implement and validate
  • Support for the new proposed Audio Data API
  • Support for HSTS security protocol allowing sites to insist that they only be loaded over SSL
  • A new feature called Panorama gives users a visual overview of all open tabs, allowing them to be sorted and grouped
  • An experimental API is included to provide more efficient Javascript animations
  • Firefox now supports the HTML5 video "buffered" property
  • Changes to how XPCOM components are registered in order to help startup time and process separation
  • New Addons Manager and extension management API (UI will be changed before final release)
  • Significant API improvements are available for JS-ctypes, a foreign function interface for extensions
  • CSS Transitions are partially supported
  • Core Animation rendering model for plugins on Mac OS X. Plugins which also support this rendering model can now draw faster and more efficiently
  • Web developers can update the URL field without reloading the page using HTML History APIs
  • More responsive page rendering using lazy frame construction
  • Link history lookup is done asynchronously to provide better responsiveness during pageload
  • CSS :visited selectors have been changed to block websites from being able to check a user's browsing history
  • New HTML5 parser
  • Support for more HTML5 form controls
  • Web authors can now get touch events from Firefox users on Windows 7 machines
  • A new way of representing values in JavaScript that allows Firefox to execute heavy, numeric code (used for things like graphics and animations) more efficiently


Changes for v4.0 RC 1 - v4.0 RC 2

  • Blacklisted a few invalid HTTPS certificates
  • Updated localizations for 29 locales
  • Added Vietnamese localization, bringing the total languages available in Firefox 4 to 83


Changes for v4.0 Beta 12 - v4.0 RC 1

  • What’s New in this Firefox 4 RC
  • General stability, performance, and compatibility improvements
  • As well as these features from previous Firefox 4 Betas:
  • Firefox 4 RC is available in 79 languages
  • Support for the proposed Do Not Track ("DNT") header
  • Connection status messages are now shown in a small overlay
  • WebGL is enabled on all platforms, but, like for other hardware acceleration features, many buggy drivers or driver versions are blocked
  • The default homepage design has been refreshed
  • Firefox no longer switches into offline mode automatically
  • Overhaul of the bookmarks and history code, enabling faster bookmarking and startup performance
  • Per-compartment garbage collection is now enabled, reducing work done during complex animations
  • The Firefox Sync setup experience has been greatly improved across desktop and mobile devices
  • Additional polish for the Firefox Add-ons Manager
  • Uses JägerMonkey, a new, faster JavaScript engine
  • Certain rendering operations are now hardware-accelerated using Direct3D 9 on Windows XP, Direct3D 10 on Windows Vista and 7, and OpenGL on Mac OS X
  • Improved web typography using OpenType with support for ligatures, kerning and font variants
  • HTML5 Forms API makes web based forms easier to implement and validate
  • Support for the new proposed Audio Data API
  • Direct2D Hardware Acceleration is now on by default for Windows 7 users
  • Firefox button has a new look for Windows Vista and Windows 7 users
  • Support for HSTS security protocol allowing sites to insist that they only be loaded over SSL
  • Firefox Sync is now included by default
  • A new feature gives users a visual overview of all open tabs, allowing them to be sorted and grouped
  • An experimental API is included to provide more efficient Javascript animations
  • Firefox now supports the HTML5 video "buffered" property
  • Tabs are now on top by default on Windows, Mac OS X, and Linux
  • You can turn any tab into an "App Tab" by right-clicking on it and selecting "Make into App Tab" from the context menu
  • Web developers can animate content using CSS Transitions
  • Responsiveness and scrolling improvements from the new retained layers layout system
  • JavaScript speed improvements due to engine optimizations
  • Changes to how XPCOM components are registered in order to help startup time and process separation
  • You can search for and switch to already open tabs in the Smart Location Bar
  • New Addons Manager and extension management API (UI will be changed before final release)
  • Significant API improvements are available for JS-ctypes, a foreign function interface for extensions
  • The stop and reload buttons have been merged into a single button on Windows, Mac OS X, and Linux
  • The Bookmarks Toolbar has been replaced with a Bookmarks Button by default (you can switch it back if you'd like)
  • Crash protection for Windows, Linux, and Mac OS X when there is a crash in the Adobe Flash, Apple Quicktime or Microsoft Silverlight plugins
  • CSS Transitions are partially supported
  • Full WebGL support is included
  • Core Animation rendering model for plugins on Mac OS X. Plugins which also support this rendering model can now draw faster and more efficiently
  • Native support for the HD HTML5 WebM video format
  • Web developers can update the URL field without reloading the page using HTML History APIs
  • More responsive page rendering using lazy frame construction
  • Link history lookup is done asynchronously to provide better responsiveness during pageload
  • CSS :visited selectors have been changed to block websites from being able to check a user's browsing history
  • New HTML5 parser
  • Support for more HTML5 form controls
  • Web authors can now get touch events from Firefox users on Windows 7 machines
  • A new way of representing values in JavaScript that allows Firefox to execute heavy, numeric code (used for things like graphics and animations) more efficiently


Changes for v4.0 Beta 10 - v4.0 Beta 12

  • This release delivers improved performance and responsiveness when watching videos on your favorite video websites. We are in the final stages of the Firefox 4 Beta cycle.


Changes for v4.0 Beta 8 - v4.0 Beta 9

  • Overhaul of the bookmarks and history code, enabling faster bookmarking and startup performance
  • Per-compartment garbage collection is now enabled, reducing work done during complex animations
  • See the complete changelist from the previous beta
  • As well as these features from previous Firefox 4 Betas:
  • Firefox 4 Beta is available in 76 languages
  • The Firefox Sync setup experience has been greatly improved across desktop and mobile devices
  • Speed, functionality, and compatibility improvements to WebGL
  • Additional polish for the Firefox Add-ons Manager
  • Uses JägerMonkey, a new, faster JavaScript engine
  • Certain rendering operations are now hardware-accelerated using Direct3D 9 on Windows XP, Direct3D 10 on Windows Vista and 7, and OpenGL on Mac OS X
  • Improved web typography using OpenType with support for ligatures, kerning and font variants
  • HTML5 Forms API makes web based forms easier to implement and validate
  • Support for the new proposed Audio Data API
  • Direct2D Hardware Acceleration is now on by default for Windows 7 users
  • Firefox button has a new look for Windows Vista and Windows 7 users
  • Support for HSTS security protocol allowing sites to insist that they only be loaded over SSL
  • Firefox Sync is now included by default
  • A new feature gives users a visual overview of all open tabs, allowing them to be sorted and grouped
  • An experimental API is included to provide more efficient Javascript animations
  • Firefox now supports the HTML5 video "buffered" property
  • Tabs are now on top by default on Windows, Mac OS X, and Linux
  • You can turn any tab into an "App Tab" by right-clicking on it and selecting "Make into App Tab" from the context menu
  • Web developers can animate content using CSS Transitions
  • Responsiveness and scrolling improvements from the new retained layers layout system
  • JavaScript speed improvements due to engine optimizations
  • Changes to how XPCOM components are registered in order to help startup time and process separation
  • You can search for and switch to already open tabs in the Smart Location Bar
  • New Addons Manager and extension management API (UI will be changed before final release)
  • Significant API improvements are available for JS-ctypes, a foreign function interface for extensions
  • The stop and reload buttons have been merged into a single button on Windows, Mac OS X, and Linux
  • The Bookmarks Toolbar has been replaced with a Bookmarks Button by default (you can switch it back if you'd like)
  • Crash protection for Windows, Linux, and Mac OS X when there is a crash in the Adobe Flash, Apple Quicktime or Microsoft Silverlight plugins
  • CSS Transitions are partially supported
  • Full WebGL support is included but disabled by default at this time
  • Core Animation rendering model for plugins on Mac OS X. Plugins which also support this rendering model can now draw faster and more efficiently
  • Native support for the HD HTML5 WebM video format
  • Web developers can update the URL field without reloading the page using HTML History APIs
  • More responsive page rendering using lazy frame construction
  • Link history lookup is done asynchronously to provide better responsiveness during pageload
  • CSS :visited selectors have been changed to block websites from being able to check a user's browsing history
  • New HTML5 parser
  • Support for more HTML5 form controls
  • Web authors can now get touch events from Firefox users on Windows 7 machines
  • A new way of representing values in JavaScript that allows Firefox to execute heavy, numeric code (used for things like graphics and animations) more efficiently


Changes for v3.6.16 - v3.6.17

  • Fixed several security issues.
  • Fixed several stability issues.


Changes for v3.6.14 - v3.6.15

  • Fixed an issue where some Java applets would fail to load in Firefox 3.6.14


Changes for v3.6.12 - v3.6.13

  • Fixed several security issues.
  • Fixed several stability issues.
  • Fixed in Firefox 3.6.13
  • MFSA 2010-84 XSS hazard in multiple character encodings
  • MFSA 2010-83 Location bar SSL spoofing using network error page
  • MFSA 2010-82 Incomplete fix for CVE-2010-0179
  • MFSA 2010-81 Integer overflow vulnerability in NewIdArray
  • MFSA 2010-80 Use-after-free error with nsDOMAttribute MutationObserver
  • MFSA 2010-79 Java security bypass from LiveConnect loaded via data: URL meta refresh
  • MFSA 2010-78 Add support for OTS font sanitizer
  • MFSA 2010-77 Crash and remote code execution using HTML tags inside a XUL tree
  • MFSA 2010-76 Chrome privilege escalation with window.open and element
  • MFSA 2010-75 Buffer overflow while line breaking after document.write with long string
  • MFSA 2010-74 Miscellaneous memory safety hazards (rv:1.9.2.13/ 1.9.1.16)


Changes for v3.6.10 - v3.6.11

  • Fixed several security issues.
  • Fixed several stability issues.


Changes for v3.6.3 - v3.6.6

  • Firefox 3.6.6 modifies the crash protection feature to increase the amount of time that plugins are allowed to be non-responsive before being terminated.


Changes for v3.0 RC 1 - v3.0 RC 2

  • Notes:
  • Mozilla Firefox®, Portable Edition is available packaged with
  • Mozilla Firefox 3 Release Candidate 2, allowing you to test
  • all the latest features in the upcoming version without
  • disrupting your current Firefox installation. Please note
  • that Firefox 3 Release Candidate 2 is a developer preview
  • release of Mozilla's next generation Firefox browser and is
  • being made available for testing purposes only. If you're
  • looking for the stable version, please head to the Mozilla
  • Firefox, Portable Edition homepage.
  • Changes:
  • New in this release:
  • Updated to RC 2
  • Added support for mimetype updating in Live (CD) mode
  • Added Japanese and Simplified Chinese packages


Changes for v3.0 Beta 5 - v3.0 RC 1

  • Notes:
  • Mozilla Firefox®, Portable Edition is available packaged with Mozilla Firefox 3 RC 1, allowing you to test all the latest features in the upcoming version without disrupting your current Firefox installation. Please note that Firefox 3 RC 1 is a developer preview release of Mozilla's next generation Firefox browser and is being made available for testing purposes only. If you're looking for the stable version, please head to the Mozilla Firefox, Portable Edition homepage.
  • Changes:
  • New in this release:
  • Firefox updated to 3.0 RC 1
  • EULA updated
  • Minor launcher bug with INI fixed


Changes for v3.0 Beta 4 - v3.0 Beta 5

  • Firefox updated to 3.0 Beta 5
  • Minor launcher bugs corrected with default settings and live mode


Changes for v3.0 Beta 3 rev 2 - v3.0 Beta 4

  • Firefox updated to 3.0 Beta 4
  • Launcher updated to handle local extensions directory


Changes for v2.0.0.14 - v2.0.0.15

  • Firefox updated to 2.0.0.15
  • Japanese and Simplified Chinese added


Changes for v2.0.0.3 - v2.0.0.4

  • Firefox updated to 2.0.0.4
  • New PortableApps.com Installer (auto-detects existing PortableApps.com install, better progress meter, etc.


Changes for v2.0.0.1 - v2.0.0.2

  • Firefox updated to 2.0.0.2 / 1.5.0.10
  • Slight name change "Mozilla Firefox, Portable Edition"


Changes for v2.0 RC3 - v2.0 Pre-Release 1

  • added license agreement
  • added Vista manifest to launcher and installer


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