I’ve recommended the browser add-on Stylish a few times over the years to help people refine the look and layout of web sites. Well, the add-on’s been sold, and sold again, and apparently the present owners are now using the add-on to suck up browsing history.
Disabled. Too bad, I’ve been using that for a long time. Some people are saying Stylus is a good replacement, but I haven’t tried that yet.
ETA: I can’t tell if this is “breaking” news or not. I’m just finding out about it now. According to the story, the bad behavior started in early 2017.
Well, different terms but they amount to about the same thing. Blocklisted add-ons are on the list of blocked add-ons, that is, those blocked from running in Firefox. Firefox knows to consult the blocklist periodicallty and, if an add-on is on the list, it’s disabled by the browser. That’s the general ideer.