I switched my family off Google after almost 20 years on our own domain. In hindsight it was ridiculously easy, although there are still some weird Google account required links that ultimately have me just moving on. Yt does run worse on FF but that's because of unlock (I believe) they tend to stall out intentionally instead of showing you ads and attempt to get you to switch.

That second part was indeed pretty self evident years ago, but I regularly watch 4k content on YouTube on low powered machine these days and can't say I see the difference anymore.

YouTube runs worse on FF if you have uBO. They do it on purpose. But if you were to use a clean Firefox install it's pretty comparable. Ofc YT is optimized for Chromium which is another factor