Thank you for reporting this! It appears that Firefox is currently experiencing an issue related to extensions. This is affecting all extensions, not just AdBlock. A fix is being rolled out as we speak! Here's some more information about what's going on: https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/

Thank you for reporting this! It appears that Firefox is currently experiencing an issue related to extensions. This is affecting all extensions, not just AdBlock. We're crossing our fingers for a quick fix! Here's a link with more information about the bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1548973