Login box insecure

Firefox (Quantum 57.0 64-bit) is telling me that the login and password box at the top of every page on the forums are insecure. Attempts to connect to the site by HTTPS are rejected.

The "edit password" form shows similar issues, which I have screencaps for:
https://78.media.tumblr.com/8309207f...f0ago1_500.png
https://78.media.tumblr.com/8ef6bb77...f0ago2_400.png
https://78.media.tumblr.com/a9314ce5...f0ago3_400.png

This is a relatively recent change on Firefox's end. Firefox is now reporting that every login box not through HTTPS is insecure.

vBulletin uses its own protection and does not require HTTPS. However, we still recommend that you use a different password to other sites (actually, you should never use the same password on multiple sites anyway).