Ad Block Plus. Once Chrome has it, I'm switching full time. I realize there's other ways to block ads with chrome, but they don't seem as efficient as ABP
There are plenty of FireFox plugins I use (primarily FireBug, but Chrome has good debugging tools and it's only a matter of time before someone builds an equivalent of FireBug for Chrome).
AdBlock Plus and NoScript give me not only less junk but block an awful lot of attack vectors. I feel kinda vulnerable without NoScript.
Oh, and a full linux-build, please. I've tested Chrome on Windows and am impressed, but as long as there's not linux build I can't use it. OSX people probably feel the same way.
The OS X battlefield will be interesting because Safari is so prominent. If Apple/Webkit decide they want to compete with Chrome, they're in an excellent position to do so - and they already have Javascript disabling, ad blocking, and GreaseMonkey support in Safari, not to mention a browser that's incredibly fast.
IMHO, these guys need to do some more marketing.
EDIT: Sorry, I'm looking for such features in Chrome.
And yeah, Firemacs is awesome. As a matter of fact, it does allow for navigation using some vi bindings by default. Even though I'm an Emacs guy, I find using hjkl a lot more comfortable than C-b C-n C-p C-f. I've heard great thing about vimperator, too.
I usually navigate by searching for some substring of the link.
Adblock is better but privoxy helped me to change. Only open Firefox(which in comparison takes like ages) for development.