Chrome – no difference.
BUT scanning the issue at the meta.discourse, found “CTRL-P”, which, with allowing Firefox to open pop-up for the particular website, appears to work – creates a full PFD rendering…
AND incorporates what looks like genuine date-time stamps, e.g.
“atipattoh 2017-01-09 09:53:20 UTC #139”
That would have been another pet-peeve to bring-up sometime…
Many thanks.