We're really sorry for this! It appears to be an issue with an expired certificate in Firefox, causing ALL add-ons to be disabled. Read more about it here: https://t.co/ZJeMHfznUW— Adblock Plus (@AdblockPlus) May 4, 2019
"9:20 p.m. UTC / 2:20 p.m. PDT:
We released Firefox 66.0.4 for Desktop and Android, as well as Firefox 60.6.2 ESR that re-enables extensions. For more information, please read the update on https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox 810 . Thank you for being patient with us! Thanks to everyone working on it!"