If you Google 'top facebook games', and you browse to each one, you will find a majority of them use Flash. Here are a few of them:

- Candy Crush (50,000,000+ monthly users)

- Dragon City (10,000,000+ monthly users)

- Criminal Case (10,000,000+ monthly users)

- Angry Bird Friends (1,000,000+ monthly users)

I'm currently working on a Flash game with a large player base. Firefox's suggestion of adopting HTML technologies is not simple when the game is 9 years old! I think many Facebook games are going to run into a similar issue.

It's getting scary now tho, it seems like Firefox and Chrome are aggressively trying to get rid of the usage of Flash. We've essentially decided that we're going to convert this 9 year old game to C++ (via Emscripten) in the next year. Good luck to everyone else who is going through the same thing as we are.