Hello rhfarm, in your SYSTEM DETAILS i can not see a version of flash (e.g. Shockwave Flash 11.5 r502 or other). If you install flash then try to disable Protected Mode, and see if that works for you, see for more info: Flash Player 11.3 Protected Mode - Windows

see also (if you don't already) : Flash 11.3 crashes

thank you

I am having the same problem all of a sudden. I have Firefox 17.0.1 and just upgraded to Flash 11.5.502.110 when whatever version I was using stopped working. I also tried updating RealPlayer, as another forum said that might be the problem. That update worked for 1 video, but I get a white screen again.

I tried another fix from another post. It worked. While in Facebook go to account settings/ security/ secure browsing/ edit/ put a check mark if there is not one, if one is there, uncheck it, save changes then go back in and recheck it, save changes, click home/ exit Facebook/ close browser/ reopen browser to see if videos are working now.........this is still working for now

I tried another fix from another post. It worked. While in Facebook go to account settings/ security/ secure browsing/ edit/ put a check mark if there is not one, if one is there, uncheck it, save changes then go back in and recheck it, save changes, click home/ exit Facebook/ close browser/ reopen browser to see if videos are working now.........this is still working for now

rhfarm -- Thank you for your replies. I just noticed that a previous comment was about Facebook. What I'm experiencing is throughout Firefox -- not just in Facebook....