Is this about embedding mixed content on a secure HTTPS webpage ?

Firefox normally allows mixed display content (images coming over http://), but blocks mixed active content (iframes and scripts).

Firefox shows a purple shield instead of a gray shield at the left end of the location/address bar in case Enhanced Tracking Protection is blocking content. You can click shield icon for more detail and possibly disable the protection.

• https://support.mozilla.org/en-US/kb/mixed-content-blocking-firefox
• https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop
• https://support.mozilla.org/en-US/kb/smartblock-enhanced-tracking-protection

See also:

• https://developer.mozilla.org/en-US/docs/web/Security/MixedContent

Thank you for your response. I'm actually working with digital Forms that are being sent from HTTPS:// content server to HTTP:// cache server for access later while off line. The sites are displaying fine, it is the digital content that seems to be getting blocked during the transfer from being received by the cache server.

Hello, are you trying to POST a form to a HTTP URL while the webpage is loaded on HTTPS? This looks like an active content as per the mixed content page. Do you see any errors on the web console for the form submit ?

Thank You

Note that Firefox shows a warning if you send a form from HTTPS to HTTP, but it is not advised to disable this warning as it is there for a reason

• about:config => security.warn_submit_secure_to_insecure