Mine has the “s”,but no lock.
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I have “Not secure” then www., no http or https
The main pages of FR are secure. When you go to a post the page may not show as secure if people post images. The links to the images may not be secure and I have found many images on FR pages will not load for me due to my browser security settings. My version of Firefox also tells me the page is not secure because there may be images or other non-secure links on the page.
As I type, this reply page shows secure but once I return to the page for this thread it will again tell me it is not.