Firefox Add-ons Aren’t Working

Firefox Add-ons Aren't Working

Here we can see “Firefox Add-ons Aren’t Working”

If your Firefox browser is not up to date, the Firefox addons may not operate. Furthermore, the issue could be caused by incorrect system date/time settings or a faulty Firefox user profile (or any of its settings/files).

#1 Restart Firefox and re-enable the addons.

  1. Open the Firefox browser and click the hamburger menu near the upper right corner of the window to access the menu.
  2. In the menu shown, select Addons, and then toggle each addon’s appropriate switch to the off position to disable it.
  3. Then enable the addons and see if the problem with the addons has been fixed.
  4. If not, try installing another addon to see if Firefox is still functioning properly. Alternatively, you can download the Firefox addon using another browser (ideally Chrome) and then drag it into Firefox to see whether the issue with the plugin has been resolved.
  5. If that doesn’t work, try starting Firefox in Safe Mode and removing any troublesome extensions (or all extensions) to see if they’re the source of the problem.
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#2 Correct Date and Time of Your System

  1. Correct the date and time on your computer by right-clicking on the clock (located in your system tray) and selecting Adjust Date/Time from the option that appears.
  2. Disable the choices for Automatically Set Time and Automatically Set Time Zone.
  3. Then, click the Change button and alter the date and time under the option of Set the Date and Time Manually.
  4. Set your system’s time zone to the right time zone and check if Firefox is free of the issue.
  5. If not, try setting your system’s date back one day to see if the problem goes away.
  6. If shifting the date back one day doesn’t work, try setting the date to the proper one and seeing if the Addons problem is resolved.

#3 Extensions.webextensions.remote should be disabled. Preferences in Firefox

1. In the address bar of the Firefox browser, type the following:


2. Now click the Accept the Risk and Proceed option.

3. In the Search Preference Name box, type extensions.web extension.remote to find the preference.

extensions.web extensions.remote

4. Change the setting of the toggle switch to False (if True) and then reopen the Firefox browser.

5. Check that the Firefox addons are working properly after relaunching the browser.

#4 Toolbars and Buttons should be removed. Customization

  1. Open Firefox and select the hamburger menu from the menu bar (near the top right of the window).
  2. Now, under the menu provided, select Customize, and then Restore Defaults in the ensuing box (near the right bottom of the window).
  3. Then, see if the Firefox addons are functioning properly.

#5 Firefox’s Dom Storage should be disabled.

  1. Start Firefox and type about:config in the address bar.
  2. Then click Accept the Risk and Proceed.
  3. Now type dom.quotaManager.useDOSDevicePathSyntax into the Search Preferences Name field.
  4. Then alter the value of the toggle switch to False by clicking on it (if already True).
  5. Restart Firefox and see whether the addons error has been resolved.

#6 In Firefox’s Options, turn on the History option.

  1. Open the Firefox menu and launch the browser (by clicking on the hamburger menu near the top right of the window).
  2. Select Options from the resulting menu, and then Privacy & Security from the left half of the window.
  3. Then scroll down and expand the “Firefox Will” choice in the History section.
  4. Select Remember History from the dropdown menu and then check to see if the problem has been repaired.
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#7 Edit the Extensions.json file. Allow Addons in a File Operation

  1. Start Firefox and type about:support in the address bar.
  2. Click the Access Folder button (in front of Profile Folder) in the Applications Basics table to open the Profile folder in your system’s File Explorer.
  3. Now close Firefox and minimize the Profile folder. Also, make sure no Firefox-related tasks are active in your system’s Task Manager.
  4. Then, in your favorite text editor, go to the Profile folder and open the extension.json file (e.g., Notepad, etc.).
  5. To open the search box, press Ctrl + F and type in app disabled. Then set all of their values to False (if True).
  6. Then look for the signed state and set its value to two (if set to 1).
  7. Save and exit the Extensions file now.
  8. Then restart your computer and open Firefox to see if the error has been resolved in its addons.
  9. If not, try disabling and enabling addons one by one to see if the problem goes away.

#8 Remove all files from the Firefox User Profile’s Storage Folder.

  1. In the address bar of Firefox, type about:support.
  2. Then, in front of the Profile Folder (in the Applications Basics table), click the Open Folder button.
  3. Close the Firefox browser and minimize the Profile folder (make sure no Firefox-related process is running in your system’s Task Manager).
  4. Then access the Storage folder after switching to the Profile folder.
  5. After that, erase everything in the storage folder and restart your computer.
  6. Launch the Firefox browser after it has been restarted to see if its addons are operating properly.

#9 Extension Files from the Firefox User Profile should be deleted.

1. Start the Firefox browser and type about: in the address bar.


2. Now scroll down to the table of Application Basics and click the Open Folder button next to Profile Folder in the table of Application Basics (which will open the Profile folder window in the File Explorer).

3. Close the Firefox browser and minimize the Profile folder window (make sure no Firefox-related process is running in your system’s Task Manager).

4. Then, under the Profile folder window, delete all of the extensions files.

5. Now delete the compatibility.ini file from your folder and restart it.

6. Restart Firefox and see whether the addons problem has been repaired.

#10 Create a new Firefox profile if you haven’t already.

  1. Make a new user profile in Firefox.
  2. Check to see whether the addons problem has been repaired. If this is the case, you can copy cert9.db to the old profile to see if that was the source of the problem.

#11 Restart Firefox.

  1. Open Firefox and select the hamburger menu from the menu bar.
  2. After that, go to Help and then Troubleshooting Information.
  3. Then, click the Refresh Firefox button and confirm that you want to refresh Firefox in the window that appears.
  4. Check if Firefox is working properly after refreshing the browser.
  5. If not, restart Firefox (as described above) and then activate the Remember History option (if it is disabled) as described in solution 7 to see if the problem has been resolved.

#12 Change the Addons’ Certificate Requirement

  1. In the address box of the Firefox browser, type about:config.
  2. Then take the risk and keep going.
  3. In the Search Preference Name, look for xpinstall.signatures.required and change its value to False by clicking on its toggle switch (if True).
  4. Then reopen Firefox to see if the addons problem has been repaired.


I hope you found this information helpful. Please fill out the form below if you have any questions or comments.

User Questions:

Why aren’t my addons working?

Check to see if your computer or gadget is connected to the internet. Reboot the gadget if the internet is functioning properly. This will reload both the OS and the app, possibly resolving the problem. If you’re having problems with only a few addons, it could be a server problem.

What happened to addons in Firefox?

On, all legacy addons were disabled in October 2018. (AMO). On AMO, legacy addons will no longer be available. If you choose to run unsupported releases to use legacy addons, you will be subject to security flaws, and we highly advise against it.

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How can I make Addons available in Firefox?

  1. In the upper right corner of the browser toolbar, click the Firefox menu symbol.
  2. Addons can be selected.
  3. Select Extensions from the left navigation window.
  4. For each extension, you want to enable, select Enable.

What happened to my Firefox addons?

Launch Firefox. Click Tools and then Add-ons in Firefox. You can view and customize all installed addons in the Add-ons panel. Click the Get Extensions link in the bottom-right corner to get to the addons page.

Why have my addons been deactivated in Firefox?

(Addons are turned off) It’s conceivable that the file(s) that store the extensions registry are corrupted. In the address box, type “about:support” and hit enter. “‘Application Basics….”‘ is located on the left side of the page logo. This will bring up the current Firefox profile in your file browser.

In Firefox, how can I unblock addons?

  1. To enlarge the menu panel, click the menu button.
  2. Select Add-ons and Themes from the dropdown menu. The page for the Add-ons Manager will appear.
  3. Select Check for Updates from the Add-ons Manager page.
  4. If prompted, click the “Restart immediately to complete installation” option.

What is the procedure for refreshing the Firefox browser?

  1. Select the menu option from the dropdown menu.
  2. In the confirmation window that appears, click Refresh Firefox, then Refresh Firefox again.
  3. When you’re done, a window will appear with a list of the data you’ve imported.
  4. Please select whether you want all or some of your windows and tabs to be restored, then click the Let’s go! button.

What is the location of Firefox’s cache?

The cache’s location can be found on the about:cache page. You can access this page using the location bar in the same way that you would a website. For security concerns, Firefox keeps cache data in files with a random name and no file extension.