Firefox 12 final version has been released on April 24, 2012, and the first Beta version of Firefox 12 has been release on March 16, 2012.You are suggest to upgrade to the latest Mozilla Firefox.
Download Firefox 12Release note for Firefox 12:
- Windows: Firefox is now easier to update with one less prompt (User Account Control)
- Page Source now has line numbers
- Line breaks are now supported in the title attribute
- Improvements to "Find in Page" to center search result
- URLs pasted into the download manager window are now automatically downloaded
- The column-fill CSS property has been implemented
- Support for the text-align-last CSS property has been added
- Experimental support for ECMAScript 6 Map and Set objects has been implemented
- OS X: WebGL performance may be degraded on some hardware
