Very useful add-on. I would like to have similar functionality for the rest of the search engines, too, though.

Please allow for this to work on Firefox mobile for android. Right now if you're a mobile user, you're basically screwed in terms of seeing sites you don't want to see in search

please, update

FF60 -70 ESR x64 - This addon is a good replacement for an old extension that blocked unwanted recurring results in Google search (e.g: Cnet, Tucows).
However, I wish it were in the recommended extensions, to feel more safe..

Personal Blocklistがうまく機能しなくなって困っていたんですが、こちらのアドオンは完璧に機能します。