Mozilla has released Firefox 13 on June 5th, 2012. Several UI changes in this update and more information can be found here and in the Release Notes. This release does not support Windows 2000 or Windows XP SP1 (or older) due to the move to MSVC 2010 compiler for the builds. Users can update via Help > About Firefox or can manually download and install the new version of Firefox via getfirefox.com site. Firefox 14 will be the next release in six weeks (July 17th).
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Archives
Firefox Releases
Current- 14.0.1 - July 17th
- 14.0.1 for Android - July 17th
- 10.0.6 ESR - July 17th
- 15.0 Beta - July 19th
- 16.0 Aurora - July 23rd
Upcoming
- 10.0.7 ESR - Aug 28th
- 15.0 for Android - Aug 28th
- 15.0 - Aug 28th
- 16.0 Beta - Aug 28th*
- 17.0 Aurora - Aug 28th*
* Dates for Aurora and Beta builds are for the code merge. Actual release date is around 1-7 days after the merge. More Info- 14.0.1 - July 17th
Firefox Developmental Channels
- Nightly -- Firefox 17
- Aurora -- Firefox 16
- Beta -- Firefox 15
- Release -- Firefox 14
Get Developmental Builds - Nightly -- Firefox 17

Ever since this version downloaded my computer has been a pile of junk. My cursor freezes and jumps, and it takes whole minutes for a tab to open. My whole computer freezes as not responding perhaps 20 times in as many minutes. I hate the new tabs feature because it slows me down. I’ve followed your instructions to undo the tabs and see if my cursor has been unfrozen, for which I thank you very much. But firefox is about to lose a user of many years, and one who even sends them money every now and then!