New revision on Phabricator that disables this test on Mac. It looks good on try: https://treeherder.mozilla.org/#/jobs?repo=try&revision=3eb1708a4069d8025b519a6bf9a47920dae3386f&selectedJob=264790209
Bug 1577000 Comment 7 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
New revision on Phabricator that disables this test on Mac. It looks good on try: https://treeherder.mozilla.org/#/jobs?repo=try&revision=3eb1708a4069d8025b519a6bf9a47920dae3386f