3.5.3
"First, albeit unscientific, impressions, are that the latest version (3.5.3) of the open source browser loads more quickly and is generally snappier than recent versions. Firefox's memory hogging behaviour of late has become one of the main reasons those adverse to IE have begun to use Google Chrome as an alternative browser of choice."
Load more quickly? LOL I made a coffee while waiting for it to load.
Memory hogging, it now uses twice as much, so much for progress!