Copy-as-GFM is broken in Firefox
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/24763 broke Copy-as-GFM.
More background can be found in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/24763#note_139821657.
Testing Update:
Chrome (+tests) work, IE 11 is supported with text only as before, Edge works too.
Edited by Tim Zallmann