MiniBump, I'd like to do a short review of the three browsers I tested.
QtWeb - Tiny amount of RAM used. It looks like it supports a lot of CSS, but nothing new. I couldn't even get any CSS3 tests to run. No sites end up looking broken. Some features are broken, though, like PixelJoint's zoom feature, where QtWeb blurs the image. Lots of small things that I'm used to in other browsers aren't here. When opening a new tab, the address bar doesn't auto-focus. Other small things like that are everywhere. It scored nothing on any CSS3 tests, and 259/555 on html5test.com.
K-Meleon - Don't use it. Abandon it and leave it to die. It breaks many sites, and while it's pretty customizable, it's not simple to do.
QupZilla - Larger memory footprint than the other two, but scores 320/555 on html5test.com and 59% on css3test.com. Runs well even on very old computers. There's a handful of skins to pick from, and it has speed dial like opera. It's currently my favorite low requirement browser. It makes me forget how slow this computer actually is.
Jet fuel can't make dank memes.