I hate browser extensions. They use way too much memory especially when they aren’t even being used that much. I very much prefer bookmarklets. They’re a little button in the bookmarks bar that do whatever you got them to do, on demand only. No hogging resources while not in use. They’re hard to find these days though. I believe that is due to the rise of mobile browsers and phone apps. Whatever the reason, bookmarklets need to be a thing again, much more than they are.
I Hate Browser Extensions