Flash on Android is not the same as Flash on Windows or OS X. Adobe and Google have both radically changed how browsers and plugins interact. Without documentation about these changes the Firefox developers need to try and make educated guesses about what Adobe and Google designed. This is a slow and hard process. Most browser are only a skin over the Android stock browser. Thus they get Flash support for free. Getting Flash working on a non-stock browser is a lot more work. Firefox 10 will provide very limited support for Flash in 2.2 and 2.3 devices. Work is ongoing on getting Flash working on Honeycomb devices.