Make sure you are not blocking content.

Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

Suggesting then to re-install or update your video drivers to start with : https://support.mozilla.org/en-US/kb/upgrade-graphics-drivers-use-hardware-acceleration TRY RUNNING WITH NO ACCELERATION for awhile to see if that improves anything. there is this : https://support.mozilla.org/en-US/kb/fix-video-audio-problems-firefox-windows and https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues & https://support.mozilla.org/en-US/kb/html5-audio-and-video-firefox

And can always do this as no harm in checking the system/os for issues : Repair System Registry and Files

Run the Windows Deployment Image Servicing and Management (DISM) and System File Checker (SFC) tools as Administrator. The DISM and SFC tools scan the integrity of the Windows image and all protected system files replaces corrupted, damaged and incorrect versions.

Windows 10 To run the DISM command use the Windows key + X keyboard shortcut to open the Power User menu, then select Command Prompt (Admin). Type "DISM /Online /Cleanup-Image /RestoreHealth" (without quotes or copy/paste) and press Enter. While running DISM you may notice the process will appear to pause at 20%. After a few minutes the operation will continue.

(For Above/Below - Windows All Other Versions - Use Search To Find Command Prompt ** Enter CMD.exe to Find ,Then Right Click & Run As Admin )

To run the SFC command use the Windows key + X keyboard shortcut to open the Power User menu and select Command Prompt (Admin). Type "SFC /SCANNOW" (without quotes or copy/paste) and press Enter. For more information on using SFC, please refer to the Microsoft KB: Use the System File Checker tool to repair missing or corrupted system files

Last but not least is run Firefox in safe mode and see what results you get : https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode and just to through a wrinkle into the mix do check your self for malware : https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware

Please let us know if this solved your issue or if need further assistance.

Thanks everyone, I tried everything you suggested and had no joy. I think there are much deeper problems going on as I am also having trouble with some updates. I did manage to fix the issue I was having by dumb luck. I guessed it was an issue with Flash and/or Java so I tried a couple of add-ons. "just-disable-stuff" did the trick as it had an option to turn images on and off. Once I cycled it my pics and videos were back. I am happy to report my laptop and I also survived a cardio stress test by using IE for almost 24 hours. Thanks for all the help!

Hello,

I am glad to hear that your problem has been resolved. If you haven't already, please select the answer that solves the problem. This will help other users with similar problems find the solution more easily. Thank you for contacting Mozilla Support.