I installed the Firemacs Firefox add-on for making Firefox respond to Emacs shortcuts, but I ended up removing it: it seems that I’ve spent so long down-translating my fingers on non-Emacs applications like Firefox that it’s easier to continue that way than to change to using the keyboard properly (or “like god intended†as Norman Walsh put it at http://norman.walsh.name/2006/11/08/firefox20). Mind you, I’ll probably enable it again after the next time that I use C-n in a text box in the browser.