What does the warning say?

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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.

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.

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