Using Chrome and Vimium on sites like Reddit and Hacker News almost feels like cheating -- "I shouldn't be able to consume this amount of information without even having to move my wrists."
Try Pentadactyl on FF. Made me switch from Chrome to FF for regular browsing. Unfortunately Chrome's limited api makes it impossible to port Penta's robustness to Chrome.
Yes. I tried some Vim plugin for Chrome. It sucked. Pentadectyle is very robust and full-featured. Difference is considerable as compared to its Chrome counterpart. Completely transforms your FF experience.