This Connection is Untrusted (https://devel.trisquel.info/groups/trisquel)

I get the following error while trying to access https://devel.trisquel.info/groups/trisquel using Abrowser:

This Connection is Untrusted

You have asked Abrowser to connect securely to devel.trisquel.info, but we can't confirm that your connection is secure.

Normally, when you try to connect securely, sites will present trusted identification to prove that you are going to the right place. However, this site's identity can't be verified.