I don't think I've ever found a Firefox extension that is both so useful and so wrong.
Conkeror extension for Firefox:
Conkeror is a mozilla based web browser designed to be completely keyboard driven, no compromises. It also strives to behave as much like Emacs as possible.
Review of Conkeror on Bill Clementson's blog:
Ok, so you've now got Conkeror installed. Let's say you've just started it up and are sitting on the "Conkeror User Manual" page. Here's an annotated example of a typical session:
press "g" or "C-x C-f": The prompt asks you for the URL.
Enter "www.google.com" RET.
Tags: conkeror firefox emacs