Firefox Notes (First offered to Windows 8 release channel users on February 27, 2013)

Check out "What’s New" and "Known Issues" for this version of Firefox below. As always, you’re encouraged to tell us what you think, or file a bug in Bugzilla. We'd also like extend a special thank you to all of the new Mozillians who contributed to Firefox 19!

If interested, please see the complete list of changes in this release.

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)
  • CHANGED
    Experience better image quality with our new HTML scaling algorithm
  • 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)
    Unresolved on v19 Resolved in v21