QUOTE(pandy @ May 5 2019, 08:25 AM)

I don't understand a thing. Is the warning a mistake? There's nothing wrong with the plugins?
The extensions are OK, but Mozilla/Firefox has apparently messed up the certificates that are used to check that extensions are legitimate (these certificates are frequently updated in the background by browsers). It's not just a warning, Firefox refuses to run most extensions without the certificates, for security reasons:
https://wiki.mozilla.org/Add-ons/Extension_Signing (unless you disable the certificate requirement, which is not recommended in the long run --then the extensions should work, but with a warning label).
QUOTE
And how does your blacklist come into it?

For blocking ads and trackers. Without it I would be drowned in ads, now that extensions used for blocking ads and tracking no longer work.
Alas Tor browser bypasses the Hosts file, so I wonder if it's safe to use right now.