After several years I'm still sticking with Opera 12 as my main, as there's simply nothing that can outcompete it in performance÷difficulty ratio yet. Really, you can't compare Chrome / Chromefox's "5 tabs, 2 GB" versus Opera 12's "45 tabs, 300 MB".
For random or more general-purpose browsing I have Seamonkey (masked as Chromefox), of course loaded with some extensions to make life easier. And for really random / one-off browsing, of the draw-and-discard kind, I have honest-to-god Chromefox (locked to an enterprise support version for the security updates value) or Midori aka "featherweight Safari".
But overall it seems I'm sticking with O12 for the foreseeable future, at least until projects like OtterBrowser truly mature. Most modern / trendy browsers are simply way too hogging with resources, way too intrusive with webservices, and seem to be intended more for the tablet / smartphone mindset of being more or less locked to only one program at a time, with all resources dedicated to it.