How Do I Fix a Corrupted Extension in Mozilla Firefox? or Why Is My Extension in Mozilla Not Working

Ugh, updates breaking extensions in Mozilla is the worst. Happened to me too. Check if the dev updated it—sometimes they’re slow.

If not, try Firefox’s "Troubleshoot Mode" (under Help menu). It disables all extensions in Mozilla temporarily so you can test.

Also, this site might help: https://addons.mozilla.org/en-US/firefox/