Youtube domain improvement (maybe other domains too)

Hi, i tried to figure out 30 minutes, why my Youtube iframes did not work even i set the Quickstart domains. Then i discovered that my iframe link is exactly https://youtube.com/ (without www or *.), so i needed to set this domain. I know, that you can’t think about all possible domains, just a friendly reminder of that ?? Maybe somebody without skills in Inspect Elements will appreciate this Quickstart add-on. Thanks.