How to disable a Mozilla Firefox Add-on
Add-ons, extensions or plugins can sometimes cause browser issues and might pose security or compatibility risks. It is a good idea to disable or delete add-ons, extensions or plugins if you suspect they're causing performance, compatibility, or security problems.
1. Click on the Menu button (the hamburger icon) in the top right hand corner of the browser window.
2. Click Add-ons.
3. Go to Extensions.
4. Locate the add-on that you want to disable, then click on the Disable button.
NOTE: You may also click the Remove button to uninstall the add-on from your browser.