I use Vimium C for navigating and it's great. However I always find myself wishing for vim movement controls, modes, and other vim features when typing text in input fields (such as the one I'm typing in right now). I looked it up and apparently Pentadactyl and Vimperator used to provide this functionality but they've been discontinued and are not available on latest Firefox.

I assume the answer is "it doesn't exist" but if it does, I would love to install it.