Just tried Firefox web browser for Android on my Galaxy S, and I think it cannot beat my favorite android web browser – Opera Mobile, for just one reason – Opera Mobile has a single column mode.
The ‘single column’ mode in Opera Mobile is really a handy thing when browsing the web on a mobile phone, because I don’t have to swipe horizontally back and forth, only scrolling down is needed.
When browsing on a mobile phone I mostly read the text content, so I don’t (very) care if the layout is broken when viewing in the ‘single column’ mode, anyways, YMMV though.