• December 6, 2023

“Couldn’t load XPCOM” error in Mozilla Firefox – how to fix?

When launching Mozilla Firefox, some users encounter the “Couldn’t Load XPCOM” error. Typically, the error occurs as a result of installing updates for the Windows operating system. We hasten to please you: it is extremely easy to eliminate such an error, and in the shortest possible time.

Eliminating the error “Couldn’t load XPCOM”

Couldn't load XPCOM

Method # 1 Reinstalling the Mozilla Firefox browser

Reinstalling Firefox is the most effective step in eliminating “Couldn’t load XPCOM”. Use Programs and Features to completely remove Firefox from your computer. Next, launch Microsoft Edge or Microsoft Explorer in order to download and install the most current version of the previously removed Firefox… Don’t forget to restart your computer after uninstalling and installing your browser!

Method # 2 Deactivation of installed extensions

Surprisingly, some extensions (or a combination of them) can cause the “Couldn’t load XPCOM” error to appear. We recommend deactivating all installed (even not used by you!) Extensions in Firefox, and then check for an error. Wait, how do you do that? Doesn’t the browser start? The answer is safe mode aka safe mode.

And no, not Windows Safe Mode, but Safe Mode for the browser itself. True, few know about it, but thanks to it, many problems that have arisen can be solved. So, pinch left Shift on the keyboard and click on Firefox icon in the taskbar. A dialog box will appear in front of you – select the option to launch the safe-mod.

How did you manage to launch Firefox? If it worked, then the problem really was the extensions. Go to the “Add-ons” section and deactivate absolutely all extensions that are installed in your browser. Close Firefox and start it again, but only in normal mode.

Method # 3 Restoring default settings

In some cases, the error “Couldn’t load XPCOM” can be the result of incorrectly set Firefox browser settings. The solution is to restore the default settings. The process is extremely simple and takes just a few seconds. Launch Mozilla Firefox in safe mode (as shown above) and double-click on the Refresh Firefox button. Remember, all of your personal data will be erased during the restore process.

Additional methods

What if none of the above worked? It’s very strange that nothing helped you, but don’t be discouraged: additional methods exist! True, they are unlikely to please you. Here’s what you can do:

  • Returning the computer to its original state (keeping personal files).
  • Using a restore point (if available).
  • Replacing Mozilla Firefox with another browser.

I would like to believe that our material helped you eliminate “Couldn’t load XPCOM”.

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