Then the browser could just pretend it is Chrome (if it isn't already) and that would easily work around your solution. I think something like this would be be

Then the browser could just pretend it is Chrome (if it isn't already) and that would easily work around your solution. I think something like this would be best served by moving to IPFS or Bittorrent. A magnet link could be provided and then browsers and plugins could use that to download the file. That way, you can distribute the load.