Security News > 2019 > May > Certificate issue disabling add-ons in Firefox and Tor Browser finally fixed
![Certificate issue disabling add-ons in Firefox and Tor Browser finally fixed](/static/build/img/news/alt/cyberattack-stats-medium.jpg)
2019-05-06 16:49
Mozilla forces third party add-ons to be digitally signed, though an expired certificate disabled these, causing confusion among users of Firefox and the Tor Browser over the weekend.