Firefox can crash for a variety of reasons, but you can quickly fix most
crashes with Firefox’s Safe Mode and Reset features. However, even
these tricks won’t fix every crash.
Web browsers are complicated pieces of software that interact with lots
of other software on your system – extensions and themes, plug-ins,
security programs, graphics drivers, and more. Incompatibilities or
out-of-date software can often cause crashes.
Use Safe Mode
Firefox has a Safe Mode that loads Firefox without loading your add-ons.
To activate Safe Mode, click the Firefox menu, point to Help, and
select Restart with Add-ons Disabled. You can also enter Safe Mode by
holding the Shift key while starting Firefox.
Try using Safe Mode for a while if Firefox is crashing. If Safe Mode
works properly, the problem is with one of your add-ons. You may want to
leave Safe Mode and disable add-ons one-by-one until you identify the
add-on causing the problem.
Reset Firefox
Firefox stores your personal data in a profile folder. Problems can
occur with your profile folder, but you do not have to waste time
identifying and fixing the exact cause. Firefox’s Reset feature will
create a new profile folder, migrating over your bookmarks, browser
history, saved passwords, cookies, and auto-fill information.
You will lose your extensions, themes, search engines, and site-specific
preferences when you reset Firefox. Extensions and themes in particular
can cause crashes, so getting rid of them and starting from a clean
profile can be helpful.
To reset Firefox to its default state, open the Firefox menu, point to Help, and select Troubleshooting Information.
Click the Reset Firefox button. Firefox will create a new profile for
you and migrate most of your old information over. The new, clean
profile should hopefully fix your crashes.
If Firefox starts crashing again after you reinstall your favorite
extensions, one of your extensions is likely causing the crashes. Try
reinstalling extensions one-by-one to identify if a particular extension
is causing problems.
Disable Hardware Acceleration
Firefox’s hardware acceleration feature uses your computer’s graphics
card to render text and objects on web pages. This speeds up web page
rendering and takes some load off your CPU. However, hardware
acceleration can cause problems with some graphics drivers and graphics
cards.
You can determine whether hardware acceleration is the problem by
disabling it. To do so, click the Firefox button and select Options.
Click the Advanced icon and uncheck the Use hardware acceleration when available checkbox.
Try using Firefox for a while after disabling this feature. If Firefox
stops crashing, hardware acceleration was likely the problem. You can
try installing updated graphics drivers and see if they fix the problem.
If they don’t, you should leave hardware acceleration disabled on your
system.
Note that you should not disable hardware acceleration if everything is working properly, as this is a useful feature.
Check for Malware
Malware can cause Firefox to crash, just as it can cause other programs
to crash on your system. If Firefox is regularly crashing, scan your
computer with an antivirus program likeMicrosoft Security Essentials. If you already have an antivirus program installed, you may want to get a second opinion from another antivirus program.
Update Software
Mozilla recommends updating the software on your system if Firefox is crashing. Here is a list of everything you should update:
- Firefox: Click the Firefox menu, point to Help, and select About Firefox. Download and install any available updates.
- Plug-ins: Visit the Firefox plug-in update check page. The page will scan your browser for outdated plugins. Follow the links to download and install updates for any outdated plugins.
- Extensions and Themes: Click the Firefox button, click Add-ons, and select Extensions. Click the gear menu and select Check for Updates. Install any updated add-ons.
- Windows: Use Windows Update to ensure Windows is up-to-date.
- Graphics Drivers: Install updated graphics drivers to fix problems with hardware acceleration.
- Internet Security Software: Install the latest versions of any firewalls, antivirus programs, Internet security suites, and other security applications installed on your system.
Hardware problems can also cause Firefox – and other software – to crash. Try checking your computer’s RAM for errors if crashes continue to occur.
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