46ccefdfe9
In Chrome M63 a warning is shown, permissions won't be automatically allowed afterwards. Reference: https://sites.google.com/a/chromium.org/dev/Home/chromium-security/deprecating-permissions-in-cross-origin-iframes Setting this early makes us future proof, while working with current versions too: Chrome < 63 gives an error because it doesn't understand the option and Firefox seems to ignore it, so both continue to work as before.