upgrade your browser to Firefox 12 and check

• getfirefox.com

If Firefox keeps crashing, you will soon become annoyed with your browser. However, there are reasons why this is happening. Once you know the potential cause of this issue, you can find a solution. Above all else, if Firefox is crashing you should make sure you are running the most recent version. This will ensure that all the most recent fixes are in place. You can download and install the latest version of Firefox at anytime by using the software update feature or heading straight to Mozilla.com. Either way, make sure you are current with the latest version – this is one of the most common ways to resolve unexpected crashes.

Afshispeaks

See also:

• http://kb.mozillazine.org/Firefox_crashes
• https://support.mozilla.org/kb/Firefox+crashes

If it freezes the computer then it sounds that there is a problem with a system driver on service that is running on the computer.

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