Cannot believe this isn't a thing, I'm also trying to switch off Chrome, it feels really clunky and sluggish, and I use this all the time to drag tabs to my other monitor. If you drag really fast sometimes it doesn't even make a new window at all.
Kind of useless only having a blacklist for the VPN - give me a whitelist so that I can use it on specific sites (which is also good for Mozilla as it means less data will be used by users that way afaik).