I used to use vimium (and tried similar extensions) but it always scared me how big the codebase was for most of the popular extensions. In the end I came up with a tiny extension for just the things I need https://github.com/h43z/jkscroll

Keyboard warrior is people who are on the 10% far end of political spectrums. I'd like a better term for such people but power users is too broad.