Its not that FF is perfect, its that no BIG (from PR point of view) got to FF8. And this is no suprise. Its only 6 week for putting new features in every new FF! There will be “silent” FF versions, with even less things to show, then current one. Implementing BIG stuff, takes time, if work is not ready it will not be merged with FF Nightly!
(Azure which is BIG thing in FF9, was in development for 6 months!! before including it in FF9, and work on it will span for another 3 FF versions, till it will be finished).