I try to use the keyboard for everything but unfortunately I haven't found a proper plugin for modern browsers. I tried to like tridactyl on Firefox but there were too many rough edges and it was unreliable (not really their fault, mainly limitations of what webextensions can do). As a result it was frustrating to have your keyboard shortcuts not work right ~25% of the time because you had the wrong part of the browser focused or something like that.

You could try Vim Vixen as an alternative: https://addons.mozilla.org/en-US/firefox/addon/vim-vixen/

vimium works okay-ish, or maybe I simply got used to it.

https://addons.mozilla.org/en-GB/firefox/addon/vimium-ff/

The main problem I have with it is it does not keep key combinations stable — if you press F → Esc → F → … (or Alt+F), it assigns different combinations for each link each time.

Ahhh ! Haven't even thought about the browser-shortcuts ! Lol I know F5 basically :/ Thanks will def look into this.