Manifest V3: Destiny. Huge advertising monopoly flexes muscles: “Manifest V2” extensions to be nuked, but “V3” cripples ad blockers.

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Google is planning to disable Manifest V2 Chrome extensions and roll out Manifest V3, which has raised concerns about the impact on ad blockers. Firefox and Safari are the only major browsers unaffected by these changes.

Google to Force-Block Ad Blockers — Time to Get Firefox?

FireFox is a better browser anyways. YouTube is probably using a lot of experimental html that is not implemented in other browsers. That is why the slow down

FireFox is a better browser anyways.

Also, Google is allegedly experimenting with artificially slowing down loading of youtube videos on firefox to push users away from using firefox.
EDIT: Just saw that the news are also here on the page.