DEVs can embed all neccessary tools button in address bar as built in. Tools button like QR code reader, Download page, refresh, share, microphone can embed in address bar (tablet or mobile no differing my mean is builtin in address bar as drop down menu) by tapping on builtin default active button on address bar
Can choose the neccessary button and tapping on it to run it
@justahero See the comment by Christian in the Feature Request topic: Include VPN in Browser.
At least you posted in the right place, as this is a service the Vivaldi would have to provide like they do for Webmail.