Thank you for your feedback. Firefox was experiencing issues with all add-ons today due to a certification issue. They've already pushed out a fix that should be installed within the next couple of hours: https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/
Please reach out to us via support@adblockplus.org if you're still having issues with using Adblock Plus past Sunday! Thanks, Jessy ABP Support Team
