Hi Admin folk
Above is a screenshot of the problem - system seems to think my Adblock Plus is on when it's off. As you can see, it definitely says Disabled. Not sure of the build of Adblock Plus, the Help isn't forthcoming in that regard.
Currently using Firefox Quantum. I did a restore of Firefox recently (some things constantly not working/outdated) and I've noticed quite a few Firefox add-ons and extensions don't work with Firefox Quantum so maybe the issue is at their end?
It happens whether signed in or not.