I think I posted once before about Vimperator, the Firefox extension that gives the browser Vim-style keybindings.
There was always also a corresponding Emacs Firefox extension, until recently. Now it has become its own standalone XULRunner-based browser.
Conkeror gives visible numeric tags to every clickable on a page, so you can follow links with the keyboard and never pick up your mouse. If your carpal tunnel is fluent in Emacs, it will thank you.
Isn't there a risk of confusing Conkeror with Konqueror, the KDE browser? Only in spoken conversation, like at parties: "Hey, nice necklace; what browser do you use?"
Image lifted from hackety.org.