Your System Details shows; Installed Plug-ins Shockwave Flash 15.0 r0 Shockwave Flash 17.0 r0 Having more than one version of a program may cause issues. Grab the uninstaller from here: '''[http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html Uninstall Flash Player | Windows]''' '''[http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-mac-os.html Uninstall Flash Player | Mac]''' Then reinstall the latest version. Flash Player '''Version 17.0.0.134<br>https://www.adobe.com/products/flashplayer/distribution3.html''' See if there are updates for your graphics drivers https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration