Top 6 Ways to Fix Fire­fox Add-Ons Not Work­ing on PC

Pankil Shah

Add-ons are an important aspect of Firefox. They help to customize your browsing experience and deliver productive and time-saving solutions. But what if those add-ons stop working suddenly? Thankfully there are ways to fix them.

Top Ways to Fix Firefox Add Ons Not Working on PC

While the reason behind Add-ons not working may range anywhere from an outdated browser to misconfigured settings, the troubleshooting solutions are pretty easy to apply. In this article, we shall cover all of them. So, let’s get right to it.

1. Re-enable Add-Ons

The Add-ons may not work if they don't start correctly when you launch Firefox. You can try disabling the Add-ons and enabling them again. Here’s how.

Step 1: Launch the Firefox on your PC. Click on the menu icon (three vertical lines) in the top right corner to go to Add-ons and themes.

Alternatively, you can also use the press Ctrl + Shift + A to achieve the same.

Firefox Add ons

Step 2: Now use the switches next to the Add-ons to disable and enable them.

Reenable Add ons

Now restart Firefox to see if the issue is resolved now.

2. Fix System Date and Time

Several Apps and programs use date and time on your PC. If your PC shows incorrect date or time, then it might create a conflict with Firefox and other apps. You can fix your computer's date and time to avoid that.

Step 1: Right-click on the clock and date icon in the Taskbar and select Adjust date and time.

Adjust date and time

Step 2: In the following window, toggle off the switch next to ‘Set time automatically’. Now click on the Change button to set a date and time manually.

Change date and time Manually

3. Disable Extension Preference

Extension preference on Firefox helps the browser disable extensions that are currently out-of-process extensions. Firefox may be assuming some extensions are out-of-process. If that's the case, you can try disabling extension preference on Firefox to see if that helps. Here’s how.

Step 1: Launch Firefox, type in about:config in the address bar at the top, and press Enter.

Step 2: You’ll see a brief warning regarding changing the advanced configuration. Click on ‘Accept the Risk and Continue’ to proceed.

Firefox Config Menu

Step 3: Type extensions.webextensions.remote in the search box at the top and use the toggle to change its value to false.

Disable Extension Preference

Now restart Firefox to see if Add-ons work fine now.

4. Avoid Using DOM Storage

Similar to cookies, DOM storage (also known as web storage) allows web developers to store per-session or domain-specific information on your browser. Any issues with the DOM storage might also interrupt the operation of Add-ons in Firefox. You can try disabling it momentarily to see if that helps. Here’s how.

Step 1: Launch Firefox, type in about:config in the address bar at the top, and press Enter. Click on ‘Accept the Risk and Continue’ to proceed.

Step 2: Type dom.quotaManager.useDOSDevicePathSyntax in the search box at the top and click on the toggle to change its value to false.

Disable DOM Storage on Firefox

5. Refresh Firefox

Lastly, if the above solutions don’t help, you might have to consider refreshing Firefox and starting from scratch. Doing so will remove your add-ons and preferences while keeping your bookmarks, saved passwords, and open tabs intact. Here’s how to do it.

Step 1: Open Firefox on your PC. Click on the menu icon in the top right, navigate to Help, and select More troubleshooting information.

Troubleshooting Information

Step 2: In the following window, click on the Refresh Firefox button to reset it.

Refresh Firefox

Step 3: Choose Refresh Firefox when prompted.

Confirm Refresh Firefox

That should do it. Since most of your browser settings are reset to their default value, Firefox should work fine now.

6. Update or Reinstall Firefox

Running older and outdated versions of Firefox might create issues with the Add-ons. So it's a good idea to keep Firefox updated.

Step 1: Open Firefox on your PC. Click on the menu icon, go to Help, and select About Firefox.

About Firefox

Step 2: Once there, Firefox should automatically start looking for any new updates and install them.

Update Firefox

Additional Comfort

Using Add-ons on Firefox is a good way to boost productivity. But any issues while operating them can easily interrupt your workflow. If you managed to find another solution than the ones mentioned above, share it in the comments below.


The above article may contain affiliate links which help support Guiding Tech. However, it does not affect our editorial integrity. The content remains unbiased and authentic.

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Pankil Shah

Written By

Pankil Shah

Pankil is a Civil Engineer by profession who started his journey as a writer at EOTO.tech. He recently joined Guiding Tech as a freelance writer to cover how-tos, explainers, buying guides, tips and tricks for Android, iOS, Windows, and Web.