Firefox 16 Released, with minor UX changes, but major for the developers.
So, the new version:

  • on Mac OS X now has preliminary VoiceOver support turned on, by default
  • Initial web app support
  • Improvements around JavaScript responsiveness through incremental garbage collection
  • New Developer Toolbar with buttons for quick access to tools, error count for the Web Console, and a new command line for quick keyboard access
  • unprefixed support for CSS3 Animations, Transitions, Transforms and Gradients
  • Recently opened files list in Scratchpad
  • Per tab reporting in about:memory page

You can download the new version of Firefox,