Both Firefox and flash player both got updated on the MeeGo running Nokia N9.
These pair of co-existing apps only got released less than 2 weeks ago and already have gotten updates (well, it is expected as bugs get reported from all around).
Firefox got updated to v11.0 and flash to v4.0.0-73.1
The updates are under-the-hood bug fixes and performance improvements. so you probably would notice any big changes.
My N9 doesn't notify me of updates though, I have to go to "my downloads list" in the Nokia store and scan through my list of apps to see the update, so in case you don't get any notifications, you might want to check in your downloads list in the Nokia store.