some time ago a recently registered user have asked a question on Server Fault (how to block mailto in firefox running on windows 10 - Server Fault), which involved Firefox browser running on Windows 10 (screenshot attached)
I left commented
superuser.com as IMHO question it is Off-Topic and I did attempted to answer question anyways...
Yet Michael Hampton replied to my comment saying "This is perfectly on topic here".
I'm looking at this question now and all of the sudden my (and Michael) comment are gone and I didn't delete it.