Edit: Replies to this thread indicate this is not fully correct as it exists on all browsers; and is likely an ad thing.
this post was submitted on 21 Nov 2023
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Laughts in agent spoofing
Browser detection is rarely done through User Agent lookup anymore. Nowadays we determine browser through feature detection.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Browser_detection_using_the_user_agent#avoiding_user_agent_detection
And yet in this case if I change my agent to any non-FF value while using FF, videos load immediately.
I set my agent back to FF, 5 second delay.