Continous Crashes Of Flash Player

Going on for 2 months now, I have been getting this message on all pages I go to:Shockwave Flash maybe busy, or may have stopped. You can stop the pluggin now, or you can continue to see if pluggin will complete. This has happened more times than I can count. I have updated the player, uninstalled, reinstalled, cleared my cashe, and tried several other things to no avail. Sometimes the message will come 3 to five times within 2 minutes or less. I have a Dell computer, operating Windows 10 and use Firefox. I have attempted other browsers, but the problem still arises. What is the problem? This was not an issue before December 2015.