Flash Player won't work with Zynga games, is there a fix?

I have upgraded my system to Windows 10 and I'm using Firefox as my browser.  I've also updated Flash to the latest but Flash player still crashes when trying to play a game in Zynga.   I have checked all the Adobe help sites, updated the settings per the instructions and even uninstalled and reiinstalled it twice using a clean copy both times.   Nothing is working.   I can use flash player on other sites, but not with Zynga or any of the games there.  Please help me fix this!