New Firefox beta includes PDF viewer.
Other changes:
Canvas elements can export their content as an image blob using canvas.toBlob()
Startup performance improvements (bugs 715402 and 756313)
Debugger now supports pausing on exceptions and hiding non-enumerable properties
Remote Web Console is available for connecting to Firefox on Android or Firefox OS (experimental, set devtools.debugger.remote-enabled to true)
There is now a Browser Debugger available for add-on and browser developers (experimental, set devtools.chrome.enabled to true)
Web Console CSS links now open in the Style Editor
CSS
Page is now supported
CSS viewport-percentage length units implemented (vh, vw, vmin and vmax)
CSS text-transform now supports full-width
Starting Firefox with -private flag incorrectly claims you are not in Private Browsing mode (802274)
Firefox beta may now be downloaded by users of Firefox 19 Beta, Windows, Mac, and Linux.
Firefox for Android beta was likewise updated. It introduces more support for ARMv6, which means that an estimated 15 million phones can now enjoy the browser. There is now a lower minimum CPU requirement of 600MHz. Other requirements include 512MB, HVGA. These cover handsets such as the T-Mobile myTouch 3G slide, HTC Wildfire S, LG Optimus One, and ZTE R750.
The other features for the mobile browser also include the following:
Added theme support
Support for Traditional Chinese and Simplified Chinese localizations
Canvas elements can export their content as an image blob using canvas.toBlob()
CSS
Page is now supported
CSS viewport-percentage length units implemented (vh, vw, vmin and vmax)
CSS text-transform now supports full-width
Holding backspace may delete text both in front of and behind the cursor (770291)
Firefox Integration in the Google Search Widget
