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You can check for problems with current Shockwave Flash plugin versions and try this:
- make sure you have the latest Flash version:
http://www.adobe.com/special/products/flashplayer/fp_distribution3.html - check for updates for your graphics drive drivers
https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration - disable protected mode in the Flash plugin (Windows Vista and later)
https://support.mozilla.org/kb/adobe-flash-protected-mode-firefox - disable hardware acceleration in the Flash plugin
https://helpx.adobe.com/flash-player/kb/video-playback-issues.html - disable hardware acceleration in Firefox
https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration
See also:
Make sure your Java (Not JavaScript) is up to date Verify Java and Find Out-of-Date Versions {web link}
Version 8 Update 65 Release date October 20, 2015