Opera used to be good but the recent versions have been really lame. I don't know what they think they are doing - The interface is so cluttered it's horrible and what used to be a simple slick browser is now a convolutted mess
I still use Opera 6 because it's so much faster and less of a resource hog than Opera 7. My only regret is that Opera 6 has trouble rendering a lot of mainstream websites properly
Firefox is okay, but I think it's vasty overrated and over-hyped. It's not that much faster than IE and is just as much of a resource hog, if not more so.
IMHO, Konqueror was way better as a standalone browser - It has none of the rendering problems Firefox sometimes has (I think Konqueror has the most compatible rendering engine of all the non-IE browsers atm. Never had a site look messed up on it.). It's a pity Konq is part of KDE otherwise I think it would have done well.
That said, Firefox is still pretty damned cool for one reason: You can customise the living buggery out of it!
The extensions system is really *really* cool. You can make the browser into anything you want with them
The customisability alone is what keeps it on my system - I've Opera-fied the interface as much as I can, even down to my beloved mouse-gesturing. It's great!
