In Firefox 50+, we no longer show the green lock with the grey warning triangle when active mixed content is blocked on a page:
Instead, we just show the green lock (same as if it were a secure page). The user has to click on the lock and open Control Center in order to see that Mixed Active Content was blocked on the page (to keep the user safe). From the Control Center, they can then disable protection, just as before.
So in these images, the Control Center part looks the same but the green lock+grey triangle icon in the urlbar is replaced with just the green lock:
The text and images in this article need to be updated accordingly.
Here is a test page where you can try this out: https://mixed-script.badssl.com/
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