Check out my first Firefox addon - VimFx does to Firefox what Vimium does to Chrome.<p>I know there is Vimperator... The problem about it is that it that after installing Vimperator Firefox is no longer Firefox. I've been using it for a long time and for a long time I've been cursing the gazillion of features it has.<p>VimFx is lightweight (27k xpi file), doesn't do much, but does it in a nice and friendly way.