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How to Fix Firefox Addons not Working on PC

If your Firefox browser is not up to date, the Firefox Addons not Working. Furthermore, the issue might be caused by erroneous system date/time settings or a faulty Firefox user profile (or any of its settings/files).

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Add-ons are a crucial part of Firefox. They can help you personalise your browsing experience and provide time-saving and efficient solutions. But what if those add-ons suddenly cease working? There are, thankfully, solutions.

Firefox Addons not Working

Also Read: Fixed: Google Chrome is waiting for cache issue on Windows

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When the user begins Firefox, the browser either launches without addons (icons do not appear) or with addons that do not operate at all (for some of the users, the issue was limited to some addons). The problem has been observed on almost all major operating systems, and it generally occurs following a Firefox update.

While the causes of Add-ons not working might range from an outdated browser to incorrect settings, the remedies are rather simple to implement. We’ll go through all of them in this article. So, let’s get this party started.

1. RE-ENABLE ADD-ONS

If the add-ons do not start successfully when Firefox is launched, they may not operate. You can try deactivating and re-enabling the Add-ons. Here’s how to do it.

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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.

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Reenable Add ons

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

2: Correct Date and Time of Your System

The date and time of your system are used for many operations (like syncing of different services) by different applications. You may encounter the error at hand if the date and time of your system are not correct which in turn conflicts with Firefox’s own internal date-time engine. In this scenario, correcting the date and time of your system may solve the problem.

  1. Right-click on the clock (shown in your system tray) and in the resulting menu, click on Adjust Date/Time.Adjusting date/time
  2. Now, disable the options of Set Time Automatically and Set Time Zone Automatically.
  3. Then click on the Change button (under the option of Set the Date and Time Manually) and then adjust the date and time.
  4. Now set the correct Time Zone of your system and then check if Firefox is clear of the error.Manually Adjust Date Time of Your System
  5. If not, then try to set the date of your system to one day back and check if the issue is resolved.
  6. If even moving one day back doesn’t work, then try to set the date to the correct one and check if the Addons issue is resolved.

3. DISABLE EXTENSION PREFERENCE

Firefox’s extension preference allows the browser to deactivate extensions that are presently out-of-process. Some extensions may be considered out-of-process by Firefox. Whether that’s the case, you can investigate if deactivating Firefox’s extension preference helps. Here’s how to do it.

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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.

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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.

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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.

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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.

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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.

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Update Firefox

Restart Firefox after that. If that doesn’t help. Try uninstalling Firefox, and download a fresh copy from the Mozilla site to install it again.

Get Firefox for Windows

7 : Remove the Toolbars and Buttons Customization

Users tend to customize toolbars and buttons as per their requirements but this customization may lead to the current addons error. In this case, restoring toolbars and buttons to the defaults may solve the problem.

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  1. Launch the Firefox browser and click on the hamburger menu (near the top right of the window).Open Customize in the Firefox Menu
  2. Now, in the menu shown, click on Customize and then, in the resulting window, click on Restore Defaults (near the right bottom of the window).Restore Toolbars and Buttons in Firefox to Defaults
  3. Then check if the Firefox addons are working fine.

8: Enable History in the Firefox Options

Firefox has a bug in which it may disable addons if remembering history is disabled. In this scenario, enabling the remember history option may solve the problem.

  1. Launch the Firefox browser and open its menu (by clicking on the hamburger menu near the top right of the window).Open Firefox Options
  2. Now, in the resulting menu, select Options and then, in the left half of the window, select Privacy & Security.
  3. Then scroll down and in the History section, expand the dropdown of “Firefox Will”.
  4. Now, in the dropdown, select Remember History and then check if the issue is resolved.Enable Remember History in Firefox

9: Edit Extensions.json File to Allow Addons Operation

Firefox add-ons may not work if entries in the Extensions.json file are not properly configured (that may stop addons from working). In this case, editing the Extensions.json file to let the addons operate may solve the problem.

PRO TIP: If the issue is with your computer or a laptop/notebook you should try using Restoro Repair which can scan the repositories and replace corrupt and missing files. This works in most cases, where the issue is originated due to a system corruption. You can download Restoro by Clicking Here

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  1. Launch Firefox and in its address bar, type:about:support
  2. Now, in the Applications Basics table, click on the Open Folder button (in front of Profile Folder) which will open the Profile folder in the File Explorer of your system.Open Profile Folder of Firefox
  3. Now, minimize the Profile folder and exit Firefox. Also, make sure none of the Firefox related processes are running in the Task Manager of your system.
  4. Then, switch to the Profile folder and open the extension.json file with your preferred text editor (e.g. Notepad, etc.).Edit Extensions.json in Firefox Profile Folder
  5. Now press Ctrl + F keys to open the search box and search for appDisabled. Then change all of its values to False (if True).Turn Off appDisabled in extensions.json
  6. Then search for signedState and change its value to 2 (if set to 1).Turn Off signedState in Extensions.json
  7. Now save and close the Extensions file.
  8. Then restart your system and upon restart, launch Firefox and check if its addons are clear of the error.
  9. If not, then disable/enable add-ons one by one and check if the issue is resolved.

10: Remove All Files from Storage Folder of the Firefox User Profile

You may encounter the error under discussion if the profile storage of Firefox is corrupt. This usually occurs after a bad update or when your operating system files are moved. In this case, deleting all the files from the Storage folder of the Firefox user profile may solve the problem (the files will be recreated on the next launch of Firefox).

  1. Launch Firefox and type about:support in its address bar.
  2. Then, in front of the Profile Folder (in the table of Applications Basics), click on the button of Open Folder.
  3. Now, minimize the Profile folder and close the Firefox browser (make sure not Firefox related process is running in the Task Manager of your system).
  4. Then switch to the Profile folder and then open the Storage folder.Open Storage Folder in the Firefox Profile Folder
  5. Now delete all of the contents of the storage folder and then restart your system.Delete the Contents of Storage Folder of Firefox Profile
  6. Upon restart, launch the Firefox browser and check if its addons are working fine.

10: Delete Extension Files from the Firefox User Profile

Add-ons may also fail to work if the file storing the extensions registry is corrupt. In this scenario, delete the extensions from the Firefox user profile may solve the problem (do not worry, files will be recreated on the next launch of Firefox).

  1. Launch the Firefox browser and in its address bar, type:about:support
  2. Now scroll down and in the table of Application Basics, click on the Open Folder button in front of Profile Folder (which will open the Profile folder window in the File Explorer).
  3. Now, minimize the Profile folder window and close the Firefox browser (make sure no Firefox related process is running in the Task Manager of your system).
  4. Then switch to the Profile folder window and delete all the extensions files there.Delete All the Extensions Files in the Firefox Profile Folder
  5. Now delete the compatibility.ini file and then restart your folderDelete Compatibility.ini File in the Firefox Profile Folder
  6. Upon restart, launch Firefox and check if the addons issue is resolved.

11: Create a New Firefox Profile

The Firefox add-ons might not work if your user profile of Firefox is corrupt. In this context, creating a new user profile may solve the problem. Before proceeding, make sure to backup essential information/data of the Firefox browser and its extensions.

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  1. Create a new Firefox user profile.
  2. Now, check if the addons issue is resolved. If so, then you can copy the cert9.db to the old profile to check if it was causing the issue.

12: Refresh Firefox

The addons issue could be a result of a conflicting addon or misconfiguration of a setting of the Firefox browser. In this context, refreshing the Firefox browser (that will remove all the addons/customizations and restore the browser settings to their defaults) may solve the problem as there isn’t any other way we check for the integrity of the application files.

  1. Launch the Firefox browser and click on the hamburger menu.
  2. Now click on Help and then click on Troubleshooting Information.Open Troubleshooting Information in the Help Menu of Firefox
  3. Then, in the window shown, click on the Refresh Firefox button and then confirm to refresh the Firefox browser.Refresh Firefox
  4. Now, after refreshing the browser, check if Firefox is operating fine.
  5. If not, refresh Firefox (as discussed above) and then enable the option of Remember History (if disabled) as discussed in solution 7 to check if the issue is resolved.

Solution 12: Change the Certificate Requirement of Addons

Firefox browser may not operate add-ons if the certificate required (add-ons require a certificate to operate so that the malicious add-ons could be curbed) for the add-ons is corrupt or expired. In this case, disabling the certificate requirement of the add-ons may solve the problem.

Warning: Proceed at your own risk as disabling the certificate requirement of addons may expose your system to malicious addons and can be a threat to your system/data.

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  1. Launch the Firefox browser and type about:config in its address bar.
  2. Then Accept the Risk and Continue.
  3. Now, search for xpinstall.signatures.required in the Search Preference Name and then click on its toggle switch to change its value to False (if True).Disable xpinstall.signatures.required in Firefox
  4. Then relaunch Firefox and hopefully, the addons issue is resolved.

If the issue is there, then try to use debug mode of Firefox (type about:debugging in the address bar and then click on This Firefox. Now click on the Load Temporary Add-ons to use the addons temporarily). 

Load Temporary Add-on Firefox

You can also try to copy the Mozilla folders from %appdata% and %localappdata% of a working installation of Firefox to the problematic system.

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ADDITIONAL COMFORT

Using Firefox add-ons to increase productivity is a smart idea. However, any problems encountered when using them might easily disrupt your workflow. If you come up with a better solution than the ones listed above, please share it in the comments section below.

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