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 fra

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 https://bugzilla.mozilla.org/show_bug.cgi?id=666058) and more efficient garbage collection are being addressed in version 8.