What issues do you have with mixed passive content? Why do you want a green padlock on these websites?

You can check the Web Console to see what content this is about.

• "3-bar" menu button or Tools -> Web Developer

Can you post a link to a publicly accessible page (i.e. no authentication or signing on required)?

Firefox doesn't block mixed passive content, but will show a special padlock when mixed passive content is detected. There is usually no need to block mixed passive content, but that is the only way to get a normal padlock.

It's my understanding this situation leaves user open to MITM attack. The issue occurs on sites w/ videos. I followed Mozilla's instructions & blocked mixed passive content on YouTube but haven't been successful on other sites. I even got several Microsoft tech 2's involved & they couldn't fix it either. However it gave me the opportunity to expose them to Firefox & Duck Duck Go during the remote sessions as I do not allow them to use anything else. So far I've gained several converts & am happy to spread the word but would love to figure this out. I've read W3 mixed content, Web security/MDN & ALL related articles, Browser Security & Mixed Content/Blackboard, Troubleshooting mixed content errors- Cloudflare articles. Publicly accessible sites are Center for Humane Technology.com & some of the links on Galactic Connection.com. From all I've read, it seems Safari is the only browser that has solved the mixed passive content dilemma & since Windows10 was configured to block it's use that's not an option for me. Thanks.