Flash Player 11.7.700.224 not playing on Firefox 22.0

Hi,
I just updated Firefox to the 22.0 version and then updated Flash Player to the above version, but when trying to play videos or games in Facebook, I get the message "Adobe Flash Player 11.1 or higher required for playing".

I downloaded the Flash Player installation program and installed the 11.7.700.224 version a few times, but the problem remains.

Would you help me resolve the issue?

Thanks!