How to Fix Firefox Add-ons Not Working Issue

Browser add-ons or extensions are modules that allow the customization of browsers, add functionality, and help improve the browsing experience of users. Nowadays, all the major browsers like Chrome, Firefox, and Microsoft Edge provide support for add-ons or extensions.

However, many users have reported an issue wherein the add-ons in Firefox have stopped working once they launch the browser. For a few users, the problem is seen with only some of the add-ons in the browser whereas for others either the add-ons are not seen at all or all the add-ons are not working. This issue can happen if your Firefox browser is outdated, the system date/time settings are not correct, or the user profile in Firefox is corrupted. If you are facing this problem with your Firefox browser add-ons, then go ahead and read this article to find some troubleshooting solutions that can help you fix this issue on your Windows PC.

 

Method 1 – Manually Re-enable the Add-ons

 

Step 1. Open the Mozilla Firefox browser.

Step 2. Go to the upper right corner of the window and click on the three horizontal lines button to open the menu.

Step 3. In the menu, click on Add-ons and themes.

 

Firefox Menu Add On Themes Min

 

Step 4. On the Add ons page, click on the Extensions tab in the left panel.

Step 5. Firstly, disable all the add-ons in the list by turning off the toggle associated with each.

 

Firefox Add Ons Disable Turn Off Toggle Min

 

Step 6. Then, enable the add-ons by toggling on the switch next to the add-ons.

After all the add-ons have been re-enabled, check if the add-ons are working.

 

Firefox Add Ons Enable Turn On Toggle Min

 

Step 7. If the issue still persists, you can add another extension in Firefox and check if the problem is fixed.

Step 8. If the problem is not yet resolved, then you can remove the add-ons and check if it was causing the issue.

To remove an add-on, on the Add-ons page, click on the three-dot menu next to the extension and choose Remove.

 



Firefox Add Ons Remove Min

 

Click on Remove again to confirm the add-on removal.

 

Firefox Add Ons Removal Confirm Min

 

Check if the problem is resolved after removing the add-on.

 

 

Method 2 – Change the System Date and Time Settings

 

Step 1. Right-click on the clock at the right end of your taskbar and select Adjust date and time.

 

System Tray Time Adjust Date Time Min

 

Step 2. On the Date & Time Settings page, toggle off the switch associated with the options Set time automatically and Set time zone automatically.

Step 3. Next, click on the Change button next to Set date and time manually.

 

Date Time Turn Off Set Time And Time Zone Automatically Min

 

Step 4. In the Change date and time window that pops open, set the correct date and time.

Then, click on Change.

 

Date Time Change Date Time Min

 

Step 5. Use the dropdown in the Time zone section, and choose the correct time zone from the list.

 

Date Time Set Correct Time Zone Min

 

Step 6. Relaunch Firefox and check if the add-ons are working without any issues.

 

Method 3 – Disable Extension Preference in Firefox

 

If the extension preference in Firefox is enabled, then Firefox can disable all the extensions assuming them all to be out-of-process extensions. So, you can disable this extension preference and check if the problem is fixed.

 

Step 1. Open Firefox.

In the address bar at the top, type about:config and hit Enter to go to the Advanced Preferences page.

Step 2. Click on Accept the Risk and Continue in the warning regarding changing the advanced configuration preferences.

 

Firefox Advanced Preferences About Config Min

 

Step 3. In the search box at the top, type extensions.webextensions.remote to look for the Extensions preference.

Step 4. Use the toggle switch associated with this preference and change it to False.

 

Firefox Advanced Preferences Disable Extension Preference Min

 

Step 5. Close and reopen the browser.

Check if the add-ons are working without creating any problems while launching the browser.

 

Method 4 – Remove Toolbars and Buttons Customization

 

Step 1. Open Firefox.

Click on the Menu button at the top right corner.

Step 2. In the menu that opens, click on More tools.

 

Firefox Menu More Tools Min

 

Now, click on Customize toolbar… in the sub menu that opens.

 

Firefox Menu More Tools Customize Toolbar Min

 

Step 3. In the Customize Firefox page, click on the button Restore Defaults at the bottom right corner.

Then, click on Done.

 

Firefox Customize Restore Defaults Min

 

Step 4. Once the default settings are restored, check if the issue with add-ons is resolved in Firefox.

 

Method 5 – Disable DOM Storage in Firefox

 

Like browser cookies, DOM Storage in Firefox is used to store per-session or domain-specific information on the browser. Any errors in the DOM storage can affect the normal working of the Firefox add-ons. So, you can disable the DOM Storage and see if the issue gets fixed.

 

Step 1. In the address bar of Firefox, type about:config and hit Enter.

Step 2. Click on Accept the Risk and Continue on the warning page that opens.

 

Firefox Advanced Preferences About Config Min

 

Step 3. In the search box at the top, type the text below

dom.quotaManager.useDOSDevicePathSyntax

Step 4. Change the value of this preference to False (if set to True) by using the toggle next to it.

 

Firefox Advanced Preferences Disable Dom Storage Min

 

Step 5. Close and reopen Firefox and check if the add-ons problem is resolved.

 

Method 6 – Enable Firefox History

 

Step 1. Launch the Firefox browser.

Step 2. In the address bar, type about:preferences#privacy to go to the Privacy & Security Settings page of the browser.

Step 3. Scroll down to the History section.

Step 4. In this section, click on the dropdown list next to Firefox will and choose the option Remember history from the list.

 

Firefox Privacy Remember History Min

 

Step 5. Relaunch the browser and check if the add-ons are working without creating any issues.

 

Method 7 – Modify the Extensions.json File

 

Step 1. In the address bar of the Firefox browser, type about:support and press Enter.

Step 2. Locate the Profile Folder row in the table with the title Application Basics.

Step 3. Here, click on the Open Folder button next to Profile Folder.

This opens the File Explorer with Firefox Profile Folder that is being used.

 

Firefox About Support Open Profile Folder Min

 

Step 4. Minimize the File Explorer and close the Firefox window.

Open the Task Manager (Ctrl + Shift + Esc) and end all the running processes that are related to Firefox.

Step 5. Go back to Profile Folder in File Explorer.

Look for the extensions.json file and open it using Notepad or any preferred text editor.

 

Profile Folder Open Extensions Json File Notepad Min

 

Step 6. Now, press Ctrl + F to open the Find box.

Type appDisabled in the search box and hit Enter to look for the text in the file.

Change the value to false (if set to true) for all the occurrences of appDisabled.

 

Extensions Json Change Value Appdisabled Min



 

Step 7. Next, perform a search as stated in Step 6 for signedState entry.

Change the value for all occurrences of signedState to 2 (if set to 1).

 

Extensions Json Change Value Signedstate Min

 

Step 8. Press Ctrl + S to save the file.

Exit the extensions.json file.

Step 9. Reboot your computer.

Open Firefox and check if the problem with add-ons not working is resolved.

 

Method 8 – Delete File from Storage Folder of Firefox User Profile

 

Step 1. Perform Steps 1 – 4 as mentioned in Method 7 above to go to the Profile Folder in the File Explorer.

Step 2. In the Profile Folder, find the folder named storage.

Step 3. Double-click on this storage folder to open it.

 

Firefox Profile Folder Open Storage Min

 

Step 4. Press Ctrl + A to select all the files in this folder and press the Delete (bin) icon at the top to delete all the files in this folder.

 

Firefox Profile Folder Open Storage Delete All Files Min

 

Step 5. Reboot your computer.

After startup, open Firefox and check if the add-ons are working.

 

Method 9 – Remove Extension Files from the User Profile

 

Step 1. Go to Method 7 above and execute Steps 1 – 4 to open the Profile Folder in the File Explorer.

Step 2. Look for extension files in the Profile folder.

Select these extension files and tap on the Delete (bin) icon to delete them.

 

Firefox Profile Folder Delete Extensions Files Min

 

Step 3. Locate the compatibility.ini file and click on the Delete icon at the top.

 

Firefox Profile Folder Delete Compatibility Ini File Min

 

Step 4. Reboot your PC.

Check if the problem with add-ons in Firefox is fixed or not.

 

Method 10 – Create a New User Profile

 

Step 1. Press Windows + R to open the Run box.

Step 2. Type firefox.exe -p and hit Enter to open the Firefox Profile Manager.

 

Run Firefox Profile Manager Min

 

Step 3. In the Profile Manager window, click on Create Profile…

 

Firefox Choose User Profile Create New Min

 

Step 4. Click on Next in the Create Profile Wizard that opens.

 

Firefox Create Profile Wizrd Min

 

Step 5. Give a name for the new user profile in the text box below Enter the new profile name.

For storing this new profile, you can either use the default folder or select a different location by clicking on Choose Folder.

Finally, click on Finish.

 

Firefox Give Profile Name Choose Folder Min

 



Step 6. Back in Choose User Profile, select the new profile name, and click on Start Firefox.

Once Firefox starts, check if the problem with add-ons is overcome.

 

Firefox Start With New Profile Min

 

 

Method 11 – Refresh the Browser

 

Step 1. Launch the Firefox browser.

Type about:support in the address bar at the top.

 

Firefox About Support Min

 

Step 2. This opens the Troubleshooting Information window.

Here, click on Refresh Firefox… button on the right.

 

Firefox Troubleshooting Info Refresh Firefox Min

 

Step 3. In the confirmation prompt that pops up, click on Refresh Firefox.

 

Firefox Troubleshooting Info Refresh Firefox Confirmation Min

 

Step 4. Once the browser opens after refreshing, check if the problem with add-ons not working is fixed.

 

Method 12 – Disable the Add-ons Certificate Requirements

 

Step 1. In the address bar of Firefox, type the text below

about:config

Step 2. To continue, click on Accept the Risk and Continue on the warning page.

 

Firefox Advanced Preferences About Config Min

 

Step 3. In the search box, type the text below to look for the certificate requirements preference.

xpinstall.signatures.required

Step 4. Change the value of this preference to False by using the toggle at the right.

 

Firefox Disable Crertificate Requirements Add Ons Min

 

Step 5. Close and reopen Firefox.

Check if the add-ons not working issue is resolved.

 

 

If the problem with add-ons still persists after trying the fixes above, then open Firefox in Debug mode.

To open in Debug mode, in the address bar type about:debugging.

Go to This Firefox tab in the left pane.

Now, click on the Load Temporary Add-on… button.

Check if the add-ons are working in the Debug mode.

 

Firefox Debug Mode Load Temporary Add Ons Min

That’s it!

Thanks for reading.

We hope that you must have resolved the issue with add-ons not working in Firefox using one of the fixes mentioned in this article. Did you find this article useful? Please let us know your thoughts and the method that worked in resolving the issue for you in the comments section below.