i had FF and chrome both installed and used them both for a while. I didnt noticed any significant speed difference, other than that chrome launches a second or two faster, yippee. I also installed it on the kids computer for a while but that didnt last long as i ended up having to uninstall it because spybot started finding all sorts of stuff every time i ran it on that PC whereas with just FF it would stay clean for weeks on end. I've also noticed this on customers PCs. It might be that FF users are just more knowledgeable in general and use better common sense, but chrome/IE seems to be like an open door for malware.
I'll stick with my FF with ad-block plus, noscript, web of trust and other add-ons i really couldnt stand to be without. Even if FF did load pages slower (which it doesnt, especially with pipelining enabled), it would still be much faster for me to use due to how i have everything customized the way i want it.