SimpleTabGroups - organize your tabs
uBlock Origin - adblocker
Prvacy Badger - block trackers
I still don’t care about cookies - remove cookie prompts
Stylus - lets you create your own css based on url
Canvss Blocker - prevents finger printing but can break websites.
I still don’t care about cookies is a must have, it is so nice to never have to click those prompts again.
A password manager is also nice. I recommend keepassxc and it’s addon