"Well, this time we really mean it: Firefox 2 is dead, long live Firefox 3! Firefox 2 has now been entirely removed from the distribution, and from Beta 2 onwards, Firefox 3 is the supplied version. In addition, we are now using xulrunner, the implementation of the Gecko layout engine (used by Firefox and other browsers) as a separate library rather than integrated into Firefox. This eases maintenance of both Firefox and the various other packages which use the Gecko engine, and will ensure that in future we do not have to issue updates to every Gecko-based application every time an update for Firefox or xulrunner is required."
