Please explain the problem in detail. What happens? What is/are the exact error message(s) ?

Please provide a public link (no password) that we can check out. No Personal Information Please !

Here is an example. I'm currently browsing Flipboard and I clicked on a link https://flipboard.com/article/tussle-involving-columbus-police-officer-goes-viral/a-DM8XjQ9lQii2lZpzE7HBAQ%3Aa%3A2519641474-1108b90d50%2Fflipboard.com

When the link opens a new tab in Firefox, the video does not load. It's just blank with a thumbnail of other clips on the side and print below where the video would have appeared

Hope this helps you to determine why this happens.

Make sure you are not blocking content.

Diagnose Firefox issues using Troubleshoot(Safe) Mode {web link}

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

https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop

Many site issues can be caused by corrupt cookies or cache.

Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.

• Delete cookies to remove the information websites have stored on your computer {web link}

• How to clear the Firefox cache {web link}