The "conversation" of this thread started with someone commenting on the fact, seemingly surprised and even bothered, that we are already talking about Firefox 8 when seemingly Firefox 6 and 7 went by so quickly we didn't notice it happening. In this context, it is incredibly relevant that Firefox 6 and 7 are still being described in the future tense, as that would imply that they haven't actually been released yet.
Versions 6 and 7 haven't been released yet, but the feature sets are locked in due to the faster major version release cycle. The recently discovered memory fragmentation issues (https://bugzilla.mozilla.org/show_bug.cgi?id=666058) and more efficient garbage collection are being addressed in version 8.
