I've been using Mozilla's extension[0] that contains everything Facebook-related automatically with Firefox containers and it's been working great.
This morning I looked for a similar extension for Google and I've found this fork[1] of Mozilla's extension. It's working as expected so far but I'd love for it to be officially maintained by Mozilla at some point. There is an open issue about it[2].
Probably the best tech we have against tech giants today. I mean, heavier solutions exist (like QubesOS), FF containers are so easy to use, I hope more people learn they exist.
If you put all G-services in their own container, google.com/mail can't access google.com/maps cookies, so, will it also not track location. Not sure actually, they indeed probably store your "consent" on their server. Could you block location services per container perhaps?
Hmm this is a smart move indeed, all of a sudden I'm logged into G-maps whereas I wasn't before... FireFox helpfully opened google.com/maps in my Google container...