Hi all; a very strange request maybe, I am looking for a way to override the internal error within Firefox that displays the grey box and the text no video with supported format

I am aware I can add extra videos to cover me and the browser will run through the stack, but I want to display a picture of Google Chrome and a link the download link in the attempt the urge people to jump ship (umm how nasty of me!) I have inculded the code below if you want to observe the error as I said the 'does not support' text is what I want to display not the standard internal error!

HELP!!

<!DOCTYPE HTML>
<html>
  <head>
    <title> example title </title>
  </head>
  <body>
    <video src="clip.mp4">
    does not support
    </video>
  </body>
</html>

This is down to individual browsers, you can't really do that unfortunatley

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