Quality not quantity
I too would prefer they delayed the launch if it means creating a totally clean browser.
And if they could fix the ridiculous memory-hogging problems that mean I need to restart Firefox every few hours to flush the gigabyte-sized memory hole it has created, that would be nice too.
But - ideally - they should be stripping it down, not adding more features. The reason I and many others originally switched to Firefox was to take a step back from the slow, ponderous, feature-heavy monster that was IE. Firefox is getting that way again - and with IE's new minimalist look, it wouldn't surprise me if a lot of people start switching back. (Even if under the minimalist hood, IE is still a clunky horror)