What’s New
NEW
Built-in PDF viewer
NEW
Firefox will offer to reset the Awesomebar search provider, if it has been changed by third-party software or through about:config
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
Starting Firefox with -private flag incorrectly claims you are not in Private Browsing mode (802274)
Known Issues
Unresolved
Certain valid WebGL drawing operations are incorrectly rejected, leaving incomplete rendering in affected pages (see 825205)
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)
Unresolved
Plugins stop rendering when the top half of the plugin is scrolled off the top of the page, in HiDPI mode (see 825734)
