Well… That seems uselessly risky and complex when you can just ask them to not do that. The issue tracker said the Youtube folks have been informed. Let’s just see if they fix that rather quickly. (but they are certainly not the only one with that kind of stuff. I’m not a big fan UA discrimination. I mean, this kind of stuff is what webcompat is all about.) (except for some purpose where you truly care about the architecture, like selecting a download link for an installer) (on the other side, I’m totally fine with feature-flags based discrimination, but that need to be done client-side).