Except their instructions are specific to whitelisting the exact subdomains in question - they aren't telling you "Enable 3rd party cookies".

Yeah I'm not agreeing with it, just think that's what he was thinking of.

Can you whitelist third-party cookies for a specific set of domains in any mainstream browser? To the best of my knowledge you can’t.

The article we're commenting on has specific instructions for how to do this in Chrome: https://support.google.com/drive/answer/2423534

You can absolutely do this in any Chromium based browser.

Go to settings, check "block 3rd party cookies"

scroll down to customized behaviors, click "Add" next to "sites that can always use cookies"

Enter the domain you want. Before saving, make sure to check "Including third-party cookies on this site".

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Or, ya know, read the instructions in the link on this post telling you to do exactly this for drive.google.com :P