A bit unfair, no? Firefox switched to the "new major version every 6 weeks (or so)" only because Google did that first with Chrome, and people started thinking "Chrome is so much better because it's in version 17 and Firefox is version 3".
> Is version 465 very different from version 464 though?
As soon as: a) you precisely define "very different" AND b) versions 464 and 465 of Firefox and Chrome are available, we can continue discussing :)