You can check for problems with current Shockwave Flash plugin versions and try this: *make sure you have the latest Flash version:<br>http://www.adobe.com/special/products/flashplayer/fp_distribution3.html *check for updates for your graphics drive drivers<br>https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration *disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later)<br />https://support.mozilla.org/kb/adobe-flash-protected-mode-firefox *disable hardware acceleration in the Flash plugin *disable hardware acceleration in Firefox<br />https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration See also: *http://kb.mozillazine.org/Flash#Troubleshooting *https://support.mozilla.org/kb/adobe-flash-protected-mode-firefox

With games like Farmville 2 on FB and Zynga the issue may actually be with the new Flash Player 19 branch used by different browsers including Firefox. https://support.mozilla.org/en-US/forums/contributors/711547?last=66923&page=1#post-66882 You could try the Flash Player 18.0.0.241 ESR branch that is on https://www.adobe.com/products/flashplayer/distribution3.html This Extended Support Release or ESR is based on Flash player 18 branch with security/stability fixes only.