A browser "crash" is not a permanent problem. It simply means the browser has encountered a problem during that browsing session, and cannot continue running. The browser will then usually close. (If not, you should terminate the browser program - Use the Windows Task Manager, or restart the computer if necessary.) When you restart the browser, it should then function normally again.
There are many factors that can lead to a browser crash. Those can include glitches in the browser's code, or problems with the operating system, or problems with a particular site that has been visited. Most current browsers (Firefox, IE, Chrome) are quite stable, but nearly every browser will experience a crash from time to time. It's a small annoyance, but not a cause for serious concern.
To minimize the likelihood of a browser crash (and other system malfunction), you should make sure that:
(1) your browser is up-to-date, and
(2) your operating system has all patches and updates installed.
The current version of Firefox is 3.6.15. It's also good idea to run a full anti-virus scan of your computer periodically, and to do other forms of regular maintenance (disk defragmentation, eliminate temporary & junk files, scan for registry errors).
SOURCE: how do i fix a mozilla firefox crash can u help me
Below are some of the ways of how you can fix the problem or at least minimize Firefox Crashing on Start up . You can start by opening the Firefox browser in a safe mode or safe mode with networking. If you do this, you can probably see the extensions that might be causing up the problems. If it opens without any hassles in safe mode then go into your regular windows and immediately disable all the extensions. Once this is done, slowly one by one add them back and determine which one of them is causing the problem. Also the profile might be a problem. For this, delete the previous one and create a new profile to get the problem resolved.
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