Hi, it might be interesting to try an ad-blocker since they seem to be causing the problem - [[How do I tell if my connection to a website is secure?]] https://addons.mozilla.org/en-US/firefox/addon/adblock-plus https://addons.mozilla.org/en-US/firefox/addon/ublock-origin ''If your question is resolved by this or another answer, please take a minute to let us know. Thank you!''

Is this about the main Yahoo page or possibly about the Yahoo mail page? This can be caused by mixed content on that web page. You can see a special padlock at the left end of the location/address bar. *a padlock with a strike through means that mixed active content is blocked. *a padlock with an exclamation mark attached means that mixed passive content (e.g. images) is present, but not blocked. The shield icon, previously used for mixed active content, is now used for Tracking Protection. *https://support.mozilla.org/en-US/kb/mixed-content-blocking-firefox *https://support.mozilla.org/en-US/kb/control-center-site-privacy-and-security-firefox See also: *https://developer.mozilla.org/Security/MixedContent