If you want a keyboard-first interface for your web browser I can recommend Vimium (which I'm sure a lot of you have already heard of). I'm not actually a Vim user (at least not yet), but I rely pretty heavily on Vimium's shortcuts in Firefox nowadays. I started using it when I had a school-provided laptop which had an awful trackpad which was way too slow and annoying to use for my taste.
Vimium: https://vimium.github.io/
Screenshot of shortcuts in Vimium: https://i.imgur.com/x1Y7OvQ.png
EDIT: I almost forgot to mention my favorite feature (which is not limited to Vimium).
Custom search engines are great! If I want to go to the Wikipedia page on aviation then I can just press Shift+o and type w aviation and it will immediately open that Wikpedia page in a new tab.
The other search engines I frequently use are: google translate, thesaurus (synonyms), and justwatch (to see if/where a show/movie is available in my country).