Google has done this before. When they blocked Hangouts in non-Chrome browsers, spoofing your User Agent would allow it to load and, probably predictably since

Google has done this before. When they blocked Hangouts in non-Chrome browsers, spoofing your User Agent would allow it to load and, probably predictably since I'm making this comment, Hangouts worked absolutely fine in Firefox. Not sure if it still works these days, but I don't use Hangouts anymore. There's also the whole Shadow DOM v0 stuff with YouTube that more or less artificially slows down rendering in non-Chrome browsers. Google is just more subtle about it.