Firefox 12 scheduled release time (subject to change) is 8 a.m. PDT in the U.S. That time has not yet arrived as of this reply. Adjust that time to your local time.

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The 64-bit release of Firefox may not occur for several months yet. Currently, there is a testing version in Nightly (Firefox 14), the least stable/secure level, and should be installed only by very experienced users for testing only. The 64-bit Plugins by third-party developers are still somewhat scarce.

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Not related to your question, but...

You may need to update some plug-ins. Check your plug-ins and update as necessary:

• Plug-in check --> http://www.mozilla.org/en-US/plugincheck/
• Adobe Shockwave for Director Netscape plug-in: Installing (or Updating) the Shockwave plugin with Firefox
• Adobe PDF Plug-In For Firefox and Netscape: Installing/Updating Adobe Reader in Firefox
• Shockwave Flash (Adobe Flash or Flash): Updating Flash in Firefox
• Next Generation Java Plug-in for Mozilla browsers: Installing or Updating Java in Firefox

You are correct, the release date for Firefox 12 is planned for today. However, it probably won't be for a few more hours. so you won't be able to update yet. Try checking for updates through the day, and eventually it will roll out :)

As for the 64bit, there are no plans to make Firefox 13 64 bit. While devs are working on 64 bit Firefox, there is no ETA for when that will arrive. Until it is announced, no one knows how the upgrade process will be performed, but it is likely those with 32 bit firefox will stay with that through upgrades (as the benefits for x64 are small for average users).

Firefox 12 is now available for update through Help > About Firefox > Check for Updates

The full installer is only available at this time here (choose your language) --> http://releases.mozilla.org/pub/mozilla.org/firefox/releases/12.0/win32/

Automatic notification for the update availability will currently be to a limited number of users to check for major problems with the update.

Firefox 12 Release Notes --> https://www.mozilla.org/en-US/firefox/12.0/releasenotes/

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Thanks a lot for all the replies, they were very helpful!