opening in incognito tab with internet disconnected to make sure it works offline and that nothing gets sent after you close the incognito tab should be safe &

opening in incognito tab with internet disconnected to make sure it works offline and that nothing gets sent after you close the incognito tab should be safe & secure but yeah you can also google the proper qr code format and make it yourself using qrencode in terminal or something like that... but for semi-public WiFis like the ones in restaurants, hotels, ... it's a survivable risk