Update: All videos are broken in your browser now, please help me or I will be forced to switch out of it

How about providing proof of the issue??? What OS? What version of Firefox. Did you try with Firefox in Troubleshoot Mode?

I have no issues with none of the sites. see screenshots

I have a copy of YouTube's old HTML5 video diagnostic page. If you load the page, you should see:

supported probably probably supported supported supported

https://www.jeffersonscher.com/sumo/html5-video.html

If yours differs, which rows show a problem?

On youtube I have this Youtube "play button" in the middle of the screen and, possibly hard to see, buffering behind that button and above the thumbnail, which didn't even load to black screen. On Bluesky, the video unmutes once I click it and the duration loads, but once I click, the play button doesn't change to pause, the video doesn't start, it's just like that no matter if it's off of the timeline or if I go to the post directly. The same goes for facebook and twitter, exactly the same result

Videos on Freepik and similar pages from where I get assets to work off of don't load either, they all go to black screen, play button not changing to pause once I click them, sound unmuting too, but of course no sound plays cause video doesn't load

I am on newest firefox version, updated to make sure it's not that which is the problem, and I'm on Windows 10, also updated, I think last friday