Hi!
Thanks for your feedback.
What you're referring to is related to an issue with an expired certificate in Firefox, causing ALL add-ons to be turned off. We're very sorry for any inconvenience this has caused for you.
Firefox has now pushed a fix for this, which should be installed automatically for you. You can find more information on it here: https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/

If this issue still exists for you past Sunday, please reach out to us via support@adblockplus.org!
Thanks,
Jessy
ABP Support Team