how can this be done?
Your own addon you’ve build?
Someone else’s addon?
From your PC addon?
Please be much more specific when asking for help
If your Add-ons page is blank or blocked, or there are not extensions listed but you are sure there must be some, restart Firefox in its Troubleshoot Mode (formerly known as Safe Mode) to check the page without the interference of any running extensions.
- Add-ons page: Ctrl+Shift+A (on Mac, Command+Shift+A), in the left column, click Extensions