Nitpick time: Got a mixed content warning from Opera when replying here. Apparently, it’s from trying to load an asset on this website, so fixing it doesn’t involve other hosts—only Discourse configuration or plugins.
I would like to disagree slightly and say that this is more than a nitpick. Insecure scripts could be MITM’d and used to intercept account credentials or information, for example.
From what I can tell, the script is that is used to generate the preview when editing posts/replies. I will note that the problem does not exist on https://users.scala-lang.org/, so I it should be easy to fix.
contributors.scala-lang.org/:1 Mixed Content: The page at 'https://contributors.scala-lang.org/' was loaded over HTTPS, but requested an insecure favicon 'http://contributors.scala-lang.org/uploads/default/original/1X/5f642d983d7b6c2d0bb0a4a48be7df98d9de9dbc.ico'. This request has been blocked; the content must be served over HTTPS.
I changed some settings on discourse + reverse proxy.
I did that only for contributors.scala-lang.org for now, and it looks ok.
I will do the same for users.scala-lang.org later this week.