I think we should include letsencrypt certificates there to improve user experience.
They will be included as soon as Mozilla includes it in their official list, which is the source we're using.
This bug appears to have been reported against 'rawhide' during the Fedora 24 development cycle. Changing version to '24'. More information and reason for this action is here: https://fedoraproject.org/wiki/Fedora_Program_Management/HouseKeeping/Fedora24#Rawhide_Rebase
I'm resolving this as UPSTREAM, because Fedora doesn't make its own decisions which CA certificates to add, we follow upstream Mozilla decisions.
*** Bug 1323510 has been marked as a duplicate of this bug. ***