Firefox is the way to go for a browser in Ubuntu. After Firefox,
SeaMonkey is a good #2 browser that could easily be the #1 browser if
Firefox wasn't so good. Epiphany is a good browser, but it's bookmark
file system kind of sucks. It forces everything to be filed in
alphabetical order, if you want it that way or not. If Epiphany ever
fixes that, Epiphany would be a really good browser. Opera works OK in
Ubuntu, but like Epiphany, it forces your bookmarks into alphabetical
order, if you want them that way or not. Konqueror doesn't run G-mail
or Yahoo Mail properly. Galeon and Kazehakase seem to be abandoned
projects.