If there is a shield icon to the left of the "Site Identity Button" (globe/padlock) on the location/address bar then that means that mixed active content is blocked.

• https://support.mozilla.org/kb/how-does-content-isnt-secure-affect-my-safety
• https://developer.mozilla.org/Security/MixedContent

You can only unblock (allow) such content globally for all web pages. You can use this extrension to make it easier to toggle the involved security.mixed_content.block_active_content pref.

• https://addons.mozilla.org/firefox/addon/toggle-mixed-active-content/

If there is mixed passive content (e.g. images) then Firefox shows an exclamation mark instead of "Site Identity Button" (globe/padlock) on the location/address bar.

I'm with oga435; there really should be a way of white-listing sites where we accept mixed content blocking. The current mixed content blocking prefs are discarded after each session, and having to globally disable mixed content blocking is a poor alternative. I have seen this request go through the formal review process and die with a "wontfix". This really makes no sense; the need to white-list sites is valid, in nearly every case the user has zero control over how the site serves up its content, and telling users to globally disable content blocking is a terrible security choice to be given as an alternative.

Maybe you should contact those website and ask them to look into this.

• https://developer.mozilla.org/Security/MixedContent/fix_website_with_mixed_content

Thank you for an utterly useless response.