If I put in Full Screen The video Crash and return to Treec…

ok thanks for heads up will take a look [[treechat bug]] which device you on?

I'm on my laptop ... Mozilla as a Browser ... with Chrome Works well ... Like the other time ... I think there's something wrong in Treechat Video codec with Firefox compatibility

I confirm.
I experienced the same behavior with a previous video (of this account) but I forgot to report it. Also here, on a laptop.