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Google slows down Firefox users when watching YouTube....
(fosspost.org)
A place to discuss the news and latest developments on the open-source browser Firefox
I know everyone wants to be mad, and I'm no fan of Google. But this is almost certainly an unintentional bug.
Google, more than anything, wants watch hours for ad money. They don't want you frustrated by the alow ux. They want you watching advertisements.
Not a bug - they literally added a 5 second timer in the code: https://old.reddit.com/r/firefox/comments/17ywbjj/whenever_i_open_a_youtube_video_in_a_new_tab_its/k9w3ei4/
Yes, there is a 5s timeout in youtube's code. However, it is not aimed at Firefox users.
The same code shows up on a fresh chrome installation without any extensions. And the code does not check for the user agent. So the 5s timeout is not there to make Firefox a bad choice for youtube. Following response to your link goes a bit deeper into what the code could mean: https://old.reddit.com/r/firefox/comments/17ywbjj/whenever_i_open_a_youtube_video_in_a_new_tab_its/ka08uqj/
That doesn't explain why it stops happening when you change your user agent in Firefox.