A unknown addon in firefox addon store with 4.5+ rating.
(From, most of the comments it’s seems like this addon is suspicious and don’t have enough proof or evidence to trust it with our data. So please everyone avoid using this addon. A better one is “UBLOCK ORIGIN”).
They will use popups asking you to upgrade to a premium version:
https://adblockultimate.net/pricing
Which is kinda silly when they seem to mostly copy the work of others:
https://github.com/mozilla/addons/issues/1078
I second the uBlock Origin recommendation.
Well that’s shady