Allegedly, on or about 03 November 2015, Heinz Diehl sent:
Where is the config option, switch or whatever changes the default
player in firefox back to html5 again?
What's the difference between the two user profiles? Accepting/refusing
cookies (could try clearing out the stored cookies for YouTube)?
Allowing/refusing scripting? Flashblock options? Logged into YouTube?
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[tim@localhost ~]$ uname -rsvp
Linux 3.9.10-100.fc17.x86_64 #1 SMP Sun Jul 14 01:31:27 UTC 2013 x86_64
All mail to my mailbox is automatically deleted, there is no point
trying to privately email me, I will only read messages posted to the
public lists.