Re: Firefox 9.0 Final
Chrome is the best browser out of the box.
Firefox is nice and configurable, but until they fix their memory management issues, you need quite a bit of RAM to use it (or restart it regularly).
My way of browsing is to open lots of tabs at once and read some while the rest loads. Firefox fails miserably in that case at it will NOT give the memory back. All other browser grow with the tab amount, but all except firefox shrink back once I close the tabs. This is why my main browser is now chrome and I use firefox + adblock/noscript as the 2nd one (both open usually, anyway).
As the universe is curved, there cannot be a straight answer...