Thank you for your feedback. We're really sorry for any inconvenience caused by this! This is related to an issue with an expired certificate in Firefox, causing ALL add-ons to be turned off. 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 past Sunday, please reach out to us via support@adblockplus.org! Thanks, Jessy ABP Support Team
