interesting and thorough comparison of Chrome, Firefox and Opera specifically on Linux here:
Web Browser Grand Prix 2: Running The Linux Circuit : Introduction
on 07/21/2010 – Made popular on 07/21/2010
Tom's Hardware: "Last week we showed Opera 10.60 to be the world's fastest Web browser. That was in the Windows world. But where do Chrome, Firefox, and Opera stand in Linux? Today we find out. Adding the Win 7 results, we'll also learn which OS has the speediest browser."