Chromium browser only real alternatve for Abrowser/Icecat browsers, IMHO.
1.Chromium have a lot of extensions. 2.Chromium have Vrome and others Vimperator-like extensions. 3.Chromium can play some patented formats, like mp3. But on the other hand, Chromium have disadvantages:1.It is semi-OpenSource. Some parts of the code not even under permissive or copyleft licenses.
2.It have problems with privacy.I think, we must set free Chromium. This is very bad, then we are have ONLY ONE libre browser.