I use FireFox beacuse I'm used to the mouse click functions (for selecting text, copy pasting, etc). On my laptop on I use Chrome so I can get used to a different browser, but it's just been very difficult for me to transfer off of FF because there are so many little things that I'm so used to over the years.
I use both. Chrome for the occasional browsing & for Facebook Ads since they have the bulk uploader tool as an extension for Chrome, but I mainly use Firefox for everything else.
I know chrome is supposedly coded much better and its more stable. but im too used to firefox. I sometimes use chrome when im on a laptop. sometimes i don't notice but if i had to choose one out of the 2 it would be firefox.
You know that both FF and Chrome have plugins/addons for that right?
Also I would die without mouse gestures. Nothing pisses me off more (except soccer) than using someone elses computer that doesn't have mouse gestures.
Opera. It has mail client, torrent client, download manager included. They invented the speed dial you can see on others now. You can use mouse gestures without plugins. You can hide the bloody scrollbar on the right side too. Love it.
I use Firefox when I need screenshots only. Chrome is pretty good, I must admit.
FF for everything. Don't trust Chrome. At all. 90% of Google's incomes is from selling advertising (pulling #'s out of my ass here) - not the kind of company I want to give an awful lot of information about myself to (even Microsoft is better in that regard since its primary revenue stream is software and SAAS more than advertising).
I've been using FF for quite sometime but it seems to lag quite abit recently. Haven't try FF5.0 so not sure if it is fixed now or maybe the lag only happens to me. Chrome is much smoother but lacks the plugins that FF have.