If Firefox starts normally, one of your extensions was causing the crash.
To see if an extension is the problem, go to the Firefox "Add-ons -> Extensions" list, disable all of your extensions and then close and restart Firefox.
The crashes may be caused by Problematic extensions, which are disabled in Firefox Safe Mode. If Firefox does not crash when you restart in Firefox Safe Mode (at the "Firefox Safe Mode" window, click "Continue in Safe Mode" or, in Firefox 15 or above, "Start in Safe Mode"): 
Note: If Firefox doesn't start up but you aren't sure whether it crashed or not and you didn't see the Mozilla Crash Reporter, see also Browser will not start up. Make sure you allow the Mozilla Crash Reporter to submit a crash report so that you can view it later to get any useful information about the crash, including related bug reports (see viewing crash reports). Try setting the javascript.options.*jit.* preferences to false in about:config ( see below).Ĭrashes that occur when starting Firefox are difficult to troubleshoot, especially if you also cannot start in Firefox Safe Mode.
Firefox Safe Mode also disables the JavaScript JIT compiler. Try unchecking the option to use hardware acceleration in Firefox (" Tools -> Options -> Advanced / General"). In Firefox 4 and above, Firefox Safe Mode also disables hardware acceleration, so the problem could be a video device or driver issue ( see below). If disabling all extensions and restarting Firefox in normal mode doesn't resolve the crash problem: Try re-enabling them one at a time, to find the problem extension. If the crashes no longer occur when you run Firefox in normal mode with all extensions disabled, one of your extensions was causing Firefox to crash. If Firefox no longer crashes when you run in Firefox Safe Mode, go to the Add-ons Manager Extensions list, click the Disable button for every extension, and restart Firefox normally. Note: If Firefox also crashes in Firefox Safe Mode, then an extension is not the problem and you should skip to the next section. This will help determine if an extension is causing the problem, since Safe Mode disables all extensions. Start in Firefox Safe Mode and click "Start in Safe Mode" ("Continue in Safe Mode" in Firefox 14 and below). Problematic extensions may cause crashes.
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