Ah, I see: yeah, I've got 3rd party cookies disabled in Firefox, so that's presumably my problem. If there were a way to make an exception only for YouTube requ

Ah, I see: yeah, I've got 3rd party cookies disabled in Firefox, so that's presumably my problem. If there were a way to make an exception only for YouTube requesting a Google+ cookie, I'd do it. But I'm not willing to give Google+ a blanket pass on all sites, and it doesn't look like Firefox's cookie controls are fine-grained enough for that. (Maybe I could look for an extension...)