You're kidding right? Vimperator and the much better fork Pentadactyl have been around for years on Firefox, and implement everything Vimium does and more, in a

You're kidding right? Vimperator and the much better fork Pentadactyl have been around for years on Firefox, and implement everything Vimium does and more, in a much more reliable way. Every single control interface is available, and scriptable in Pentadactyl. Vimium isn't even the best vimperator clone for Chrome - cVim has now taken that crown by a very large margin, and is worlds better in terms of features, configuration and reliability.