Opened https://www.reddit.com/ in Private Browsing and measured it after some ten or fifteen seconds, 92.69MB (38MB of objects—of which 16MB is ArrayBuffer—33MB of scripts, 7MB of DOM nodes, 5MB of other, 2MB of strings).

https://old.reddit.com/, 13.70MB (1MB of scripts, 1MB of other, 2MB of objects, 6MB of DOM nodes, 782KB of strings).