Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

I tried to join a webinar and received an error stating the media could not be loaded because the format is not supported, using Firefow/Win 8.1.

  • 1 reply
  • 3 have this problem
  • 19 views
  • Last reply by cor-el

more options

I attempted to join a photography webinar and the system said "The media could not be loaded either because the server or network failed or because the format is not supported. I am running Win 8.1 and have the latest Firefox. Any ideas?

I attempted to join a photography webinar and the system said "The media could not be loaded either because the server or network failed or because the format is not supported. I am running Win 8.1 and have the latest Firefox. Any ideas?

All Replies (1)

more options

If you use extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) that can block (wanted) content (e.g. Adblock Plus, NoScript, Ghostery, uBlock Origin) always make sure such extensions do not block (wanted) content.

  • make sure your extensions and filters are updated to the latest version