I really wish I didn't have the message, "Press Esc to exit full
screen mode." splayed across the center of the screen for the five
seconds EVERY time I go to full screen mode (which is every time I
watch a video on YouTube).

OK. I get it. I can press 'escape' to get out of the full-screen mode.
I don't need to be reminded. I would rather just watch the video
without having to restart it every time to see what I had missed.

If we have to have that message on there, can we at least get it out
of the center of the picture? Or perhaps program the cookie to
remember that I've already seen that message?

Thanks for your attention to this problem.