EDIT: They spoke to, but IMHO, did not give enough time to, Cory Doctorow and Brewster Kahle. They mentioned Mastodon đź‘Ť, and described the Fediverse while not actually calling it that! A bit frustrating.
I saw a GitHub repo that explained add-ons that are "useless" and add more finger printing. The biggest reason of them being useless was generally the fact unlock origin already has the feature too.
That's not just how fingerprinting works. Any setting on your browser that is not default and any addon makes your browser setup more unique. From my understanding they don't need to access your plugin listing or request settings because they can also do it based off of how the browser behaves. If you disable JavaScript entirely I suppose you wouldn't have this issue though.
Why would librewolf specifically advise that you minimize your extensions to decrease client uniqueness if it had no effect on client uniqueness? Someone's misinformed, and I don't think its librewolf.
the only reason I'm still using Privacy Badger is the feature that hides embeeded iframe widgets until a "view" button is clicked (for example, embeeded tweets etc)
Maybe just bad research. I haven't tried, but I'm sure if you search for "how to protect yourself online" some of the SEO manipulating websites show up in the first results.
Privacy Badger does more than dFPI. dFPI just isolate cookies. Privacy Badger blocks cookies. And completely block connection to some hosts that are dedicated to tracking, which prevent other forms of tracking that aren't cookie-based.