firefox will not play video. Quote

Thank you for reaching out to us via Forums! We are sorry to hear that you're having issues with Firefox not playing video. I suggest attempting to clear your cookies and cache [instructions below] or attempt to use a different browser or device. If you are still experiencing issues after troubleshooting, please email us a screenshot screenshot along with the info as to which device you are using. Feel free to reach out to us at any time!

1-800-685-9236 (USA)
CustomerService@vsmedia.com

Clearing Cookies and Cache for Firefox: Click the menu button. and select Options. ...
1. Select the Privacy & Security panel.
2. In the Cookies and Site Data section, click Clear Data….
3. Remove the check mark in front of Cookies and Site Data. ...
4. With Cached Web Content check marked, click the Clear button.
5. Close the about:preferences page. -AL
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