This yellow 'warning' has been appearing in Firefox, only on the Geekzone site. I'm not too sure whether it is actually a Firefox warning, though.
When it shows up, it clears part of the page, so I can't see posts etc, with a big white box which you can scroll past.
I've gone back to Firefox lately are finally giving up on Edge -- with Microsoft I'm kind of like an obsessive ex who keeps coming back for more abuse:) If I remember, I'll fire up Chrome to view Geekzone, but it's a nuisance.
Not too sure if this is actually Firefox warning me, Geekzone trying to get me to subscribe, or... something else.