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conkeror.org

Firefox(well, Gecko) + Emacs = Conkeror.
Emacs in JavaScript is another way of putting it. Text editing is still not up to par with real Emacs, sadly. It's pretty close, though.
What I find neat is (with a bit of hacking to the extension's package) you can use either Firefox extensions or write your own in JavaScript.
I'm really amazed at how much faster everything I do on the web is done in Conkeror as compared to Firefox.
I stopped used an RSS reader because I can visit a blog I want to read with a keychord. All bookmarks are accessable with an ido-like completion functionality. Same with most search functions.
Many major-modes (for different sites) are built-in.

I wouldn't be using Emacs were it not for Conkeror.

*feel free to move this to the lounge if you think it inappropriate

That's an interesting idea. Generally, I use Firefox for the same reasons that you use Conkeror, it seems--it's all about the keyboard shortcuts. I find that my Firefox usage is very keyboard driven these days. Being able to customize all that further would be a big help. It would be even more interesting if Firefox would incorporate some of this in the standard product so you wouldn't have to choose.

Oh, it's in Debian sid, now.