Well, that guy should clearly have gotten fired when he let "new major revision number every 6 weeks" get past him out the door, anyway, cause he's clearly professionally incompetent.
This is just more evidence; the change they wish to make -- of which I too am intolerant -- is one that they should not make for a *very good reason* -- a reason which I would place bets lots of the people who are naysaying have mentioned, but which I note none of this coverage seems to mention:
The items they wish to move "inside" the framing of the tabs *are not items which are different on a per-tab basis*; those items *do not belong inside the tabs*.
So, what they're doing is violating one of the standard WIMP design/layout metaphors, which was done that way for very good reason: because it's intuitive the way it is.
But then, it doesn't surprise me much to find that Firefox, like Android, is in pretty dire need of adult supervision.