Is this just Facebook, or are there other sites also?

Go to Real.com and download the current full installer.

See if there are updates for your graphics drivers https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

It was just FB.

In Firefox, I went Tools, Add-ons, Plugins, and found it and set it to 'Always Activate'. I sure hope this doesn't open me up to something bad, but it's working for this problem.

Crap. Now the video flashes on the screen briefly, then goes black.

check this:

• see if there are updates for your graphics drive drivers

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)

https://forums.adobe.com/message/4468493#TemporaryWorkaround

• disable hardware acceleration in the Flash plugin

https://forums.adobe.com/thread/891337 See also:

• http://kb.mozillazine.org/Flash#Troubleshooting

FredMcD said

check this:

• see if there are updates for your graphics drive drivers

https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

Tried this and got no improvement.

• disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later)

https://forums.adobe.com/message/4468493#TemporaryWorkaround

Followed this link. Scrolled up to the top and read about disabling RealPlayer. That fixed it. Didn't bother disabling protected mode.

Thanks for the assistance!!

Glad to help. Safe Surfing.