Add-Ons not working, Can't download/install new ones
Last night around 10-ish my add-ons quit working suddenly. Now I remember something like this happened last month but I also saw it happened to several people so I wasn't worried. But I didn't see a topic about it this time (although I might not have looked well enough?) so I don't know if it's just me.
It won't let me try to install an alternative add-on, and if I right click it'll say to check my connection, but isn't my connection fine if I'm using the internet anyway? Right clicking it says it's a corruption issue.
The certificate used by the add-ons expired. https://support.mozilla.org/en-US/questions/1258165#answer-1218833 fixed the issue for my v54.
Thank you thank you! It helped right away, all I had to do was add the extension to firefox.
I am glad to hear that your problem has been resolved. If you haven't already, please select the answer that solves the problem. This will help other users with similar problems find the solution more easily.
Thank you for contacting Mozilla Support.
Why are you using this very old Firefox version with known security vulnerabilities?