Mozilla has released the latest stable version of Firefox. The most significant changes and improvements are the developer tools especially Web Developer Toolbar and Command Line. The new Web Developer toolbar sits on the bottom of the application with big command line input for faster access.

Other changes and improvements:
  • Firefox on Mac OS X now has preliminary VoiceOver support turned on by default
  • Initial web app support (Windows/Mac/Linux)
  • Acholi and Kazakh localizations added
  • Improvements around JavaScript responsiveness through incremental garbage collection
  • CSS3 Animations, Transitions, Transforms and Gradients unprefixed in Firefox 16
  • Recently opened files list in Scratchpad implemented

Well, Mozilla Firefox 16 is already in the Ubuntu repository. Please run a system update the get the latest version of it :)
  • sudo apt-get update
  • sudo apt-get upgrade

Below is the demo video of command line feature in Mozilla Firefox 16.

Regards :)