Chrome 68 will mark websites that use http but not https as insecure and warn users. See https://www.neowin.net/news/chrome-68-will-mark-http-websites-as-not-secure This will will finally happen in July 2018 (i.e. now).
We should update our websites so that they all use https. Namely:
- http://lists.einsteintoolkit.org/pipermail/users/ (and all of mailman really)