Q about firefox and youtube videos
FC21.
If this question is off-topic for this list,
please delete and ignore.
I have 2 profiles on Firefox.
They both have identical add-on's via firefox's drop-down menu
Tools -> Add-ons
on both profiles, add-ons have identical setup/configuration.
On one profile, I can play youtube vids, no problem.
On the other profile, youtube plays, but does not 'display'
the video. The video screen remains black.
I checked and rechecked the settings on both profiles
and they are identical.
So, what else should I look at to get to the bottom of this.