I’m not incredibly concerned with it- checking that was like the third time I’ve done that in the last six months. I only use incognito specifically to test if my extensions are breaking something or a webpage is just fucked.

What? Using Firefox? Or using incognito with no extensions?

Afaik, browser fingerprinting is pretty much unavoidable. Your best option is to just use the most generic setup possible. Alternatively, I’ve heard librewolf has some anti-fingerprinting options. No clue if they’re useful or that browser even works since I don’t use it.

Firefox. I used an incognito tab, and I have all extensions turned off since I mostly use incognito to check if they’re fucking with something.

Youtube doesn’t work when not signed into a Google account, or if one is connected to a VPN.

Youtube works fine without an account? I just checked. It also works fine with a VPN, again I just checked. Maybe this is a country thing, or something with your browser?