As per usual, those who "compare" browsers are full of fail. There are more than just five browsers, though shills and lazy people would rather you not be aware of that.
Flock died because it didn't gather enough support to maintain it. Why didn't it gain enough support? Because those who "compare" browsers ignored it, never including it in comparisons despite its value and functionality.
K-meleon is dying, without a major update in almost a year because its number of users, programmers and donators is waning. K-meleon has all the features, plugins and functions of Firefox without the bloat, and uses the same Mozilla engine, but "writers" ignore it at every turn.
http://kmeleon.sourceforge.net/
Opera is rarely spoken of in browser comparisons because, again, shills choose to ignore it. If Opera weren't the dominant browser in cell phones, I'd wager it wouldn't be mentioned as much as it is or in this page's comparison.
QtWeb is based on Apple's webkit and is gaining some support, but "writers" rarely talk about it. Are they too lazy to look for other browsers, or too busy shilling for the largest ones to curry favour?
http://www.qtweb.net/
There are plenty of good, modern, full-featured browsers that deserve mention and testing, especially those that are "lighter" than the five focused on by this writer. Unfortunately, people seem unwilling to make an effort to look for or research them. They're like shoppers buying into the "culture of walmart" instead of supporting a local businessman.
Lightweight but full-featured browsers are a far better option for netbooks and Flash RAM sticks than slow-loading and bloated browsers designed for desktop PCs. I would like to see more professionalism and thoroughness by writers, but the watchword nowadays is, "Better to do it fast than to do it right."
Contrary to the popular maxim, building a better mousetrap DOESN'T mean the world will beat a path to your door. You could ask Gary Kildall about that one, if he were still alive.
.