Ublock Origin is an obvious one, but I also can’t stand not having Foxy Gestures anymore. It adds customizable mouse gestures, so you can set it up to have easy swipes to go back a page, reload a page, close a tab, etc, and it feels wonderful and smooth to use compared to just using the traditional buttons to do everything. Honestly it’s kinda wild to me that this isn’t more popular now that people are so used to phone gestures. It’s good for the same reasons!
Very creepy ToS: https://teddit.net/r/sysadmin/comments/izpazs/any_way_to_block_grammarly_in_every_shape_and/g6ke3hn/?context=3
That said, I’m not sure if it’s the same for the paid version (as I mainly use it to make fewer typos in reddit/lemmy posts, it’s not something I want to pay for :D)