Yes Opera is superior to Firefox but it has some problems with flash... and it's closed!
But have you tried Kazehakase
as used by Fluxbuntu and Ubuntulite?
It's a "Gecko based web browser using GTK", "a web browser using the Mozilla rendering and networking engines."Midori
is also interesting but still in its early stages of development, so most of the options are not configurable. It is a project to watch. "Let's hope that Midori won't reach the bloatedness of the other browser that was supposed to be lightweight"...
K.I.S.S. ===> "Keep It Simple, Stupid"
"Simplicity is the ultimate sophistication." (Leonardo da Vinci)
"Everything should be made as simple as possible, but no simpler." (Albert Einstein)