These crashes can be caused by a recent Flash 11.3 update.

See:

• https://support.mozilla.org/kb/keep-flash-up-to-date-and-troubleshoot-problems
• https://support.mozilla.org/kb/flash-crashes-or-does-not-load-firefox-13
• http://forums.adobe.com/thread/1018071?tstart=0
• http://blogs.adobe.com/asset/2012/06/inside-flash-player-protected-mode-for-firefox.html

If you have submitted crash reports then please post the IDs of one or more crash reports (bp-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx).
You can find the IDs of the submitted crash reports on the about:crashes page.
You can open the about:crashes page via the location bar, like you open a website.

See:

• http://kb.mozillazine.org/Mozilla_Crash_Reporter
• https://support.mozilla.org/kb/Mozilla+Crash+Reporter

I was having the same problem.... But I keep forgetting that when you upgrade firefox... or it updates automatically... you need to right click on the firefox start up icon, go into properties, click on the compatibilities tab, and put a check in the "Run This Program As An Administrator" box, then hit apply. Start Firefox, and it should work OK. Problem is...each time you upgrade firefox and/or I think Adobe flash... you need to make sure that box is checked. This is on Firefox 15.0.1 with Adobe Flash 11.4.402.278 all up to date, Windows 7 64bit. If Firefox has Adobe flash add-on, it needs to run in admin mode or it will crash.

cutmetal,

Checking your username for previous posts (here) I see that you also posted the same information in a number of other threads today.

You don't normally need to check the "Run This Program As An Administrator" box in Firefox -> Properties -> Compatibility tab, to prevent crashes after updating Firefox or Flash. If you need help with this issue, you should ask a new question. You can use this link as a starting point: https://support.mozilla.org/questions/new

Alice... I was not seeking an answer, as this was the solution that was causing mine to crash after updating firefox and flash. After much frustration, this solved it for me. I posted in all the forums where others were having a crash, as it may be the same problem and they seem to be related to what I was having. It was posted in the hopes it would solve their problem. All they can do is try it..... Then the group at Mozilla.org can work out why Firefox with the latest flash needs admin rights or not. I also have zone alarm set pretty high on security... so it could be that it does need to be run as admin... it is worth a try...