Some facts about Firefox (Fennec) to get things straight:
* it does support Flash but plugins are disabled by default cause the team found they (ie Flash) bloat things up

* it has a number of addons from desktop that microb doesn't. it's an "official" mozilla platform so you can expect more addons in the future

* the engine is superior to microb and particularly in html5 it's much better. notably, it includes offline storage so going forward it will give a much better google apps experience.

* the UI seems to try to go around maemo and while the result is interesting i find the microb interface more usuable. firefox's left/right/top menus are sometimes awkward while panning and the lack of pointer mode breaks some stuff.

Ideally we'd have microb with the current fennec engine. Let's see if nokia updates.