Open your profile folder:
       From the Help menu, select More Troubleshooting Information. The Troubleshooting Information tab will open.
       Under the Application Basics section next to Profile Folder, click Show in Finder. A window will open that contains your profile folder. 
   Note: If you are unable to open or use Firefox, follow the instructions in Finding your profile without opening Firefox.

   Open the extensions folder inside your profile folder. Inside the extensions folder there are folders or XPI files for each extension and theme that you have installed.
   To determine which folder or XPI file corresponds to the extension you want to uninstall, return to Firefox and the Troubleshooting Information tab.
   In the Extensions section, find the extension you want to remove and note the string in the ID column.
   Click the Firefox menu at the top of the screen and select Quit Firefox.
   Delete the folder or XPI file that corresponds to the extension ID you noted above.

I am getting the following message in settings of Firefox: "Your browser is being managed by your organisation." These are the problematic extions: {"{02274e0c-d135-45f0-8a9c-32b35110e10d}":{"install_url":"https://addons.mozilla.org/firefox/downloads/latest/pkcs11-module-loader/latest.xpi","installation_mode":"normal_installed"},"{443830f0-1fff-4f9a-aa1e-444bafbc7319}":{"installation_mode":"normal_installed","install_url":"https://addons.mozilla.org/firefox/downloads/latest/token-signing2/latest.xpi"}} I have followed the below steps and thus removed the add-on but yet I am not able to get message "Your browser is being managed by your organisation." Is there a fix to the issue? ''Uninstall manually If you can't remove an extension from Firefox using the other methods described above, you can manually remove it. First navigate to the folder where extensions are installed: Open your profile folder: From the Help menu, select More Troubleshooting Information. The Troubleshooting Information tab will open. Under the Application Basics section next to Profile Folder, click Show in Finder. A window will open that contains your profile folder. Note: If you are unable to open or use Firefox, follow the instructions in Finding your profile without opening Firefox. Open the extensions folder inside your profile folder. Inside the extensions folder there are folders or XPI files for each extension and theme that you have installed. To determine which folder or XPI file corresponds to the extension you want to uninstall, return to Firefox and the Troubleshooting Information tab. In the Extensions section, find the extension you want to remove and note the string in the ID column. Click the Firefox menu at the top of the screen and select Quit Firefox. Delete the folder or XPI file that corresponds to the extension ID you noted above.''