If I remember right they were defederated for being overall toxic and there were a number of nazi-esque people on that instance specifically. I may be totally misremembering though.
Yeah, I use librewolf which does that. However I also like this because it’s a totally separate app so I can just swipe with three fingers between my workspaces to access it.
Never heard of them but quick research makes me think sorta. These all seem to be mobile apps but this is for linux desktop. It keeps all these sites in one app as opposed to just making a desktop shortcut.