There's a plugin for firefox which allows firefox to behave more like Vim. Some of the features include:
* Vim-like keybindings (h,j,k,l,gg,G,0,$,ZZ,,etc.)
* Ex commands (:quit, :open www.foo.com, ...)
* Hit-a-hint like navigation of links (start with 'f' to follow a link)
* Vim-like statusline with a wget-like progress bar
* Macros to replay key strokes
The author really threw in the kitchen sink. I've seen my co-worker using this, and it's SUPER cool.