Navigating directly to https://forum.level1techs.com sometimes returns this from the server:
A refresh fixes the issue. This has been happening for a few weeks.
Firefox 57.0.3
Umatrix disabled for domain.
Ill clear my cache and see if it happens again.
Can confirm that this happened to me twice yesterday. I haven’t had it happen since though and didn’t report because I thought it was temporary.
I’m also on Firefox 57.0.3
I saw it today too, Waterfox 56.2.2
I’m surprised you don’t have a mixed content sign instead of the green lock !
But I can confirm this happens to me as well.
Just happened to me, and has been happening often.
FF 57.0.2