The issue could be caused by one of your add-ons. Restart Firefox with Add-ons Disabled to check if that's the case.

• Diagnose Firefox issues using Troubleshoot Mode

If the problem goes away in Safe Mode, you can either try to determine which add-on is to blame, or you can Reset Firefox and get rid of them all.

• Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems
• Refresh Firefox - reset add-ons and settings

Note that you have a few extensions that can block content or cookies or otherwise interfere with retrieving data

• If you have many extensions then first enable half of the extensions to test which half has the problem.
• Continue to divide the bad half that still has the issue until you find which one is causing it.

It is also possible that web pages use a <video> tag to use a HTML5 media player.

You can disable this media player by setting these prefs to false on the about:config page.

• media.windows-media-foundation.enabled
• media.directshow.enabled

The issue is resolved. The problem is 1 of 4 add ons that block Google tracking. That being the case, I do not need to see any video that Google needs to track.

Thank you so much everyone. Let's all keep Google from meddling. It's no one's business what I look at or what sites I visit. And, I'm not in the 18 to 34 yo age group and therefore am not a "consumer" that needs ads.

_{edit: removed attached picture (philipp)}