Right now the best Vimperator successor for me. It provides minimal features like open, sarch, tabbing shortcutting etc.

What it still lacks is:
* great vim-like search
* browsing
But it's a work in progress so I've high expectations.

What's unfortunate you can't use addons on mozzilla pages, so i.e. you will still need to ctrl+w to exit about:addons instead of your bind.