YouTube borked when users enable Firefox anti-fingerprinting:
Firefox users have recently started to notice that YouTube does not display videos properly when they enable the browser's anti-fingerprinting technology for better privacy.
When the privacy.resistFingerprinting privacy feature is enabled in Firefox, the feature will make the browser more resistant to fingerprinting scripts.
As fingerprinting can be used to track a user between different properties and even sites, it is a common feature suggested in Firefox privacy hardening guides.
A recent change on YouTube, though, is causing videos to have display problems when this feature is enabled.
[...] BleepingComputer has been able to reproduce this issue in both Firefox 72 and the recently released Firefox 75, so this is not an issue caused by Mozilla.
(Score: 4, Insightful) by driverless on Friday April 17 2020, @11:08AM
And you've just answered your own (rhetorical) question right there. Mozilla gets nearly all its income from Google, so it always has to suck up to Google. So end result is you get a second-rate Chrome clone built on Google technology and tied to Google's surveillance infrastructure. May as well just use Chrome directly, or if you prefer Firefox as it used to be before Mozilla fscked it up, Waterfox or some equivalent, which is what I'm using.
And buy Alex Kontos a beer if you ever run into him. He does more to keep the Firefox dream alive than a 1000-person corporation.