Video files are playing audio without video (just a black screen)

Video files are playing audio without video. It just shows a blank screen. These same videos work just fine in Chrome, thogh.

Try to disable hardware acceleration in Firefox (you need to close and restart Firefox).
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
You can check for problems with current Flash plugin versions and try these:
*disable a possible RealPlayer Browser Record Plugin extension for Firefox and update the RealPlayer if installed
*disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later)
*disable hardware acceleration in the Flash plugin
*http://kb.mozillazine.org/Flash#Troubleshooting

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