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This article deals with Firefox closing unexpectedly, or closing after an error dialog (e.g., the ) appears. • If Firefox hangs, freezes, or stops responding to user input but does not close, see. If Firefox is crashing, first make sure you are using the latest public release version of Firefox, which will have the most recent fixes. You can download and install the latest version of Firefox from or you can use the feature from within Firefox. You may also wish to review the for your Firefox version, to see if the issue and solution is listed under 'Known Issues'. Crash logs may help you to locate the problem. [] Extensions may cause crashes.
Start in Firefox and click 'Start in Safe Mode' ('Continue in Safe Mode' in Firefox 14 and below). This will help determine if an extension is causing the problem, since Safe Mode disables all extensions. Note: If Firefox also crashes in Firefox Safe Mode, then an extension is not the problem and you should skip to the next section. 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.
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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. Try re-enabling them one at a time, to find the problem extension. If disabling all extensions and restarting Firefox in normal mode doesn't resolve the crash problem: • In Firefox 4 and above, Firefox also disables hardware acceleration, so the problem could be a video device or driver issue (). Try unchecking the option to use hardware acceleration in Firefox (' -> Advanced / General'). • Firefox also disables the JavaScript JIT compiler. Try setting the javascript.options.*jit.* preferences to false in ().
[] Other installed software Other installed software that is running on your computer may be causing Firefox to crash. In addition to the products listed below, Firefox crashes can be caused by Internet content-filtering or parental control software such as, and similar products. If disabling the software stops the crashes, contact the product's support site see if there are any program updates or settings you can change to work around the problem (or uninstall the program, if you don't need it).
[] McAfee SiteAdvisor The SiteAdvisor component included with McAfee's Internet security software can cause Firefox to crash at startup, among other problems. (See also on a memory leak issue with the SiteAdvisor add-on.) Even though McAfee SiteAdvisor is installed as a Firefox extension, if Firefox crashes at startup you may not be able to remove or disable it from within Firefox. To resolve the problem, you can remove SiteAdvisor using the McAfee uninstaller (see McAfee's article, for details). Note: Some versions of McAfee SiteAdvisor are already on the. [] Trusteer Rapport (an application promoted by some banks for malware protection) may cause Firefox to crash. If you use this software, try disabling it as follows: • On Windows: Go to 'Start -> All Programs -> Trusteer Endpoint Protection -> Stop Trusteer Endpoint Protection' • On Mac: Go to 'Apple menu -> System preferences -> Other > Trusteer Endpoint Protection > Stop Trusteer Endpoint Protection' If that stops the crashes, try updating the software to the latest version, uninstall the program if you don't need it, or contact.
[] ZoneAlarm ForceField (either standalone or included with ZoneAlarm Extreme Security) may cause Firefox to crash on certain websites or crash at startup. Try clearing the ZoneAlarm virtual cache (depending on ZA version, go to 'Browser Security -> Settings -> Advanced' or 'Internet -> Web Security -> Office 365 install skype for business mac download. Settings') then click 'Clear Virtual Data' and restart Firefox.