Just notice "Performs removal in deeply nested iframes" is easy to be reproduced on mac, becase time-out or failed on my local build.
Bug 1622369 Comment 12 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
Just notice "Performs removal in deeply nested iframes" is easy to be reproduced on mac, becase of time-out or failed on my local build.