Firefox 11.0 Date added: March, 14th 2012 - (Open Source)

What's new in this version:

NEW:
- With Sync enabled, add-ons can now be synchronized across your computers
- Firefox can now migrate your bookmarks, history, and cookies from Google Chrome
- The CSS text-size-adjust property is now supported
CHANGED:
- Redesigned media controls for HTML5 video
HTML5:
- The outerHTML property is now supported on HTML elements
- View source syntax highlighting now uses the HTML5 parser 
DEVELOPER:
- The Style Editor for CSS editing is now available to web developers
- Web developers can now visualize a web page in 3D using the Page Inspector 3D View
- SPDY protocol support for faster page loads is now testable
- XMLHttpRequest now supports HTML parsing
- Files can now be stored in IndexedDB 
- Websockets has now been unprefixed
FIXED:
- Various security fixes
- Firefox notifications may not work properly with Growl 1.3 or later