I'm a Firefox person. I have been for the last 3 years. It started when I was visiting several sites at once using IE6 and my taskbar had more browsers running that work apps! After some discussion with a few friends, Firefox was recommended. I gave it a go, and was amazed. Within a few weeks, my work PC, home PC, laptop & several other systems i had control of now used Firefox as it's default browser.
Then my girlfriends brother told me about Opera. A similar browser. He kept telling me how Opera was better, blah blah! I nearly beleived him, and for a month at the end of last year, Opera was my main browser! But it just didn't feel as good as Firefox. It was slightly quicker, but had less features!
Never-the-less, Opera have just released Opera 9.2 and it comes with a rather nifty feature which I'd love to see on Firefox.
When you open a new tab in Opera, instead of showing a blank page, it'll show 9 boxes which render 9 user-defined websites! Clicking on either of these thumbnails will load the site in the same tab!
I think it'd be perfect for web-developers who run several sites at once. For instance, if they crack open a new tab, and it shows the developer their own websites, which would tell the developer whether they're websites were online or not!
I'm sure it's got plenty more uses, but that's all i can think of at the moment. I will have a play around with Opera at a later date, but until then, Speed Dial is a nice addition to a nice browser.
Check out the screen cast here!