[Fix] Mozilla Firefox Keeps Crashing Constantly on Startup

Yesterday I faced a very strange problem with Mozilla Firefox web browser in one of my computer systems. Suddenly Firefox started crashing at startup. As soon as I tried to launch Firefox, it opened for a second and immediately closed. Then the traditional Mozilla Crash Reporter window opened with “We’re Sorry” message and options to send crash report to Mozilla servers.

The Mozilla Crash Reporter provided 2 buttons: Restart Firefox and Quit Firefox. Obviously, I clicked on “Restart Firefox” button. It again opened Firefox which immediately crashed on startup. Again Crash Reporter launched and the same process continued happening again and again.

After a few tries, Mozilla provided a dialog box to restart Firefox in Safe Mode. It also didn’t work. So Firefox was not opening/launching at all. It was just crashing continuously on startup.

I tried various solutions to fix this annoying issue such as restarting Firefox in safe mode with all add-ons disabled but it didn’t help. I also tried to temporary disable my security software program (antivirus and firewall) protection, it also didn’t fix the crashing issue. (Many times security software cause crashing issues in web browsers. So if you face a crashing issue in any web browser, first try to disable your security software protection. It works many times. It happens due to incompatibility issues between web browsers and security software new versions.)

In fact I uninstalled and reinstalled Firefox but unfortunately it also didn’t fix the irritating crashing issue. Firefox kept crashing on startup.

At the end I tried my ultimate solution which I always try whenever Firefox starts giving issues in any of my computer machines and it worked perfectly. It fixed the crashing issue and Firefox started opening fine.

Today in this tutorial, I’m going to share my ultimate solution to fix all kind of crashing problems in Mozilla Firefox web browser. If you also face Firefox crashing problem in your computer and Firefox crashes at startup/launch time or while opening websites or tabs, this solution will fix Mozilla Firefox in your computer.

So let’s share our solution to fix Firefox crashing problems:

STEP 1:

Press WIN+R keys together to launch RUN dialog box. Now type %localappdata% and press Enter key.

It’ll open “C:\Users\User_Name\AppData\Local” folder in Windows Explorer.

STEP 2:

Now double-click on “Mozilla” folder present in “Local” folder. Now navigate to “Firefox\Profiles” folder. Under “Profiles” folder, you’ll see a folder with name “Random_Numbers_Letters.default” folder. In our computer the folder name was “3ssgkt6r.default”. The folder name is randomly generated at installation time. So the folder name will be different in your computer but the folder name will end with .default string.

STEP 3:

Inside the .default folder, you’ll see several folders.

Select following 4 folders:

• cache2
• jumpListCache
• OfflineCache
• startupCache

STEP 4:

After selecting above mentioned 4 folders, press Delete key on your keyboard. Don’t worry. These folders contain cache data only. You’ll not lose any important data such as cookies, favorites, custom settings, etc.

Deleting these folders will clear the startup cache and other cache such as jumplist items, etc.

That’s it. Now try to open Firefox and it’ll open without any issues. Now Firefox won’t crash on startup any more.

PS: This solution will also make Mozilla Firefox opening/launching faster in your computer.

Also Check:

Fix Mozilla Firefox Slow Loading and Crashing Problems by Clearing Startup Cache

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