It is possible that security software (anti-virus, firewall) is causing problems. Try to disable security software temporarily to see if that makes a difference. Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems. *http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/ *http://www.7tutorials.com/4-ways-boot-safe-mode-windows-10 ---- You can check for issues caused by plugins. *set plugins to "Ask to Activate" on the about:addons page (3-bar Menu button/Tools > Add-ons > Plugins) *plugins are not affected by Firefox Safe Mode You can check for problems with current Shockwave Flash plugin versions and hardware acceleration in Firefox 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 (Windows Vista and later)<br>https://support.mozilla.org/kb/adobe-flash-protected-mode-firefox *disable hardware acceleration in the Flash plugin<br>https://helpx.adobe.com/flash-player/kb/video-playback-issues.html *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

cor-el, Your comprehensive suggestions are much appreciated. Thank you. carter39