Firefox, latest version 24 on linux runs very nice.
Firefox has been very fast and stable at least in the last 5 releases.<p>I can't stand chromium ( I don't use chrome ), it lacks too many options and it's really annoying that it closes the browser when you close the last tab.
It's a bug, not a feature, god dammit!
All the extensions for it are just hacks that don't really work.<p>I only open chromium for some weird site not really rendering well or that displays any bug with adblock turned on in firefox.
It really depends on what are you looking for a browser, i you want speed, go with chrome, they developed a realy cool engine now call "blink" and it's fast, no doubt.
But if you want a browser with less errors and you want to support a free internet and the use of real free software, use firefox, mozilla fundation is awesome and their comunnity helps eachother out a lot.