Most people use Firefox which is the default browser on 80% of distros. A few
use Konqueror (KDE). Gnome uses Epiphany as its browser, although Galeon is
still available. I also like Flock which is a social browser built on top of
Firefox, using Gecko. There are several forks in the Mozilla project, Seamonkey,
Iceweasel, Iceape, etc. Yes, Kazehakase works in Linux.

I have the following browsers installed in Ubuntu 8.04: elinks (text mode),
Dillo (small), Epiphany, Firefox 2 and 3, Flock, Galeon, Iceweasel, Kazehakase,
Konqueror 3 and 4, Links 2 (text), Skipstone, Seamonkey (Mozilla). and surfraw
(console). In Wine I have Safari, IE6, Chromium (Chrome from Codeweavers based
on google's open sourced code), Avant, Netscape, K-meleon, Maxthon2, and I would
install more oldies if I could find them just for nostalgia. There is also Lobo,
a java based browser that I have installed.

Plus I have a number of quasi-browsers installed such as GGZ Gaming Zone, Amaya,
WebHTTrack, and media based ones.

And the winner is... Firefox due to its configurability and features.