So these videos are on Facebook? then I would have to say, based on your error, you are logged into a Facebook account that doesn't have permission to view the videos, they were deleted, or there is an issue with Facebook (the video is being processed still, etc.)

I would have said the same thing IF it were just one of my computers. I cannot view them from my laptop or desktop. They are on Facebook, but like I mentioned one of them is my own video. I cannot see these videos on my Facebook page, but a friend was viewing it yesterday and when I asked her where she seen that video she sent it to me, so....after trying to view my own video, it wouldn't allow me to open it. It says it's a Firefox HTML doc, and the other says it a Facebook (fsbs???something or another video). Where would I look on Facebook to see if I have video's locked or something???

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance/Themes).

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.org/kb/Safe+Mode

Also check the settings in your security software to make sure that it isn't blocking such content or change the content type in the HTTP response headers.