Firefox 36 adds full HTTP/2 support, a newly released update to the HTTP protocol which should lead to faster browsing, reduced bandwidth usage and better security for connections.
Additionally, the update includes Partial Media Source Extensions (MSE) support, allowing for better support of native HTML5 playback on YouTube, but only for videos at 720p or under.
Finally, Firefox 36 adds 'Flash Protected Mode' which runs Flash as a 'low integrity process.' Basically, if you're terrified of having Flash run but have to have it installed, the protected mode should work wonders.
The rest of the list (via ghacks):
•Pinned tiles on the new tab page are included in Firefox Sync.
•The -remote startup parameter has been removed from Firefox. It was used to execute commands in an already running instance of the browser (e.g. open a new url)
•Uzbek locale added.
•Insecure RC4 ciphers are no longer accepted if possible
•1024-bit RSA keys are phased out.
•The Crash Reporter is displayed when the shut down hangs.
•Connect Developer Tools and Firefox for Android using WebIDE
•JavaScript code that is evaluated dynamically can be debugged now
•Promise rich output in the web console
•Additional paste options in markup view
•Support for meta name="referrer" added
•EMCAScript 6 Symbol data type enabled by default
•Improved ES6 generators
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