Thanks for reaching out to us! We've actually reached out to the developers at Mozilla to get this sorted on their end. They are still working on this. In the meantime, Some users have found success by removing Adblock Plus using the the instructions in this link https://help.eyeo.com/en/adblockplus/uninstall-adblock-plus?5de59f86, and reinstalling via https://adblockplus.org. Let us know if this helps!
ABP Support Team