Hiya,

I'm running Firefox 52.0.2. Suddenly, this site, which used to give me a secure log-in, no longer does. I've logged in anyway because my last email to support didn't seem to change anything.

The whole site is http, not https. Can you at least make the login secure? 

Thanks,

Celinashope

It's a complicated issue with https and http to work together. We're working on the next version to support https for login.
And to add on to what Jin said, it's still secure. However, Firefox decided to push sites towards using HTTPS, so now anything that isn't HTTPS (even if it's still secure like our site) will give that notice. We tried switching to HTTPS, but it caused some major issues so we decided to simply leave it for now until we complete the next version of the site that we're working on. 
Since three days I am also getting non secure login for MDL also tried it on chrome. After waiting for a day I logged in anyway.