Version history for Mozilla SeaMonkey (PortableApps)

Changes for v2.21 - v2.22

Mozilla platform changes
Web Audio support has been added.
CSS3 background-attachment:local support to control background scrolling has been implemented.
Many new ES6 functions have been implemented.
iframe document content can now be specified inline.
Fixed several stability issues.

Changes for v2.16.2 - v2.17.1

Continued performance improvements around common browser tasks (page loads, downloads, shutdown, etc.).
Continued implementation of draft ECMAScript 6 (clear() and Math.imul).
Various
The Details button on the Crash Reporter has been fixed (bug 793972).
Fixed several stability issues.

Changes for v2.14.1 - v2.15.1

SeaMonkey-specific changes
SeaMonkey can be set as default client/browser on Mac and Linux now.
Mozilla platform changes
The new IonMonkey compiler improves JavaScript performance.
Preliminary support for WebRTC has been added.
Image quality has been improved through a new HTML scaling algorithm.
CSS3 Flexbox has been implemented.
Support for new DOM property window.devicePixelRatio has been added.
Support for @supports has been added (disabled for now).
Startup time has been improved through smart handling of signed extension certificates.
HTML5: Support for W3C touch events has been implemented, taking the place of MozTouch events
Insecure content loading has been disabled on HTTPS pages (see bug 62178).
Responsiveness for users on proxies has been improved.
Fixed several stability issues.

Changes for v2.14.1 - v2.15

SeaMonkey can be set as default client/browser on Mac and Linux now.
See the changes page for minor changes.
The new IonMonkey compiler improves JavaScript performance.
Preliminary support for WebRTC has been added.
Image quality has been improved through a new HTML scaling algorithm.
CSS3 Flexbox has been implemented.
Support for new DOM property window.devicePixelRatio has been added.
Support for @supports has been added (disabled for now).
Startup time has been improved through smart handling of signed extension certificates.
HTML5: Support for W3C touch events has been implemented, taking the place of MozTouch events
Insecure content loading has been disabled on HTTPS pages (see bug 62178).
Responsiveness for users on proxies has been improved.
Fixed several stability issues.

Changes for v2.11 - v2.12

Added support for SPDY networking protocol v3.
Implemented WebGL enhancements, including compressed textures for better performance.
Optimized memory usage for add-ons.
Implemented the CSS word-break property.
Implemented high precision event timer.
HTML5: Added native support for the Opus audio codec.
HTML5: Added support for the source element media attribute.
HTML5: Added support for the audio element and video element played attribute.
Fixed several stability issues.

Changes for v2.9.1 - v2.10

SeaMonkey-specific changes
The domain name is highlighted in the location bar by default now, configurable in Preferences.
The amount of tabs to be restored concurrently can be configured in Preferences now.
News username and password auth dialogs have been combined and show for which server the prompt is now.
Mozilla platform changes
The new minimum supported Windows version is now XP SP2, Windows 2000 support has been dropped.
The SPDY protocol now enabled by default for faster browsing on supported sites
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.
Fixed several stability issues.

Changes for v2.3 - v2.3.2

SeaMonkey 2.3.2 contains the following major changes relative to SeaMonkey 2.2:
(SeaMonkey 2.3.2) - Revoked the root certificate for DigiNotar due to fraudulent SSL certificate issuance (see bug 682927 and the security advisory)
Several fixes when importing email from Microsoft Outlook
Mozilla platform changes
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 a plugins check link to the Plugins pane of the Add-ons Manager
Added support for the element, touch events and Server-Sent Events

Changes for v2.0.14 - v2.2

Major Changes
Windows: Bundled extensions/add-ons (ChatZilla, DOM Inspector and JavaScript Debugger) are no longer optional in SeaMonkey's installer (but can still be disabled or removed using the Add-ons Manager) (Bug 666518).
Archive options can now be changed from the Copies & Folders Account Settings pane (Bug 607295).
Fixes
Opening message attachments did not work anymore (Bug 665313).
All LSOs (Flash cookies) were cleared when clearing only the cache (Bug 665336).
The Composer status bar displayed an incorrect status (Bug 657214).
Email senders were displayed as quoted when the name in From was quoted (Bug 652318).
Windows 7: Downloads to network shares could be corrupted (bug 545650).
Opening messages from Advanced Search results did not work anymore (bug 660882).
The Archives folder was rendered inaccessible after archiving a news posting (bug 660845).
On the first wizard page for creating a new Sync account, the Next button was disabled until you switched the server type and back (bug 664569).

Changes for v2.0.11 - v2.0.12

The new Data Manager is opened instead of the previous separate management windows.
Sync (f.k.a. Weave) is now included directly in SeaMonkey. Sync allows you to keep your browsing history, passwords, bookmarks, preferences and tabs in sync across different devices (computers) in a secure way.
The new DoNotTrack HTTP header can be configured in Preferences, Privacy & Security
Lightweight themes (Personas) support for the Address Book, Composer, and MailNews windows.
Much improved startup speed.
WebGL and D3D are now enabled where supported

Changes for v2.0.9 - v2.0.10

Interleaving document.write and appendChild can lead to duplicate text frames and overrunning of text run buffers (Bug 607222)
Fixed in SeaMonkey 2.0.10
MFSA 2010-73 Heap buffer overflow mixing document.write and DOM insertion

Changes for v2.0.4 - v2.0.5

Security fixes
Fixes for a number of non-security-relevant crashes, increasing the stability of the whole platform and the Mail & Newsgroups part of SeaMonkey
New available languages: British English and Simplified Chinese
Some updates to the in-product help content