Bugzilla

When websites open windows without providing a URL, `about:blank` is shown in the urlbar of the new window. It might be difficult for users to evaluate whether they should trust the content of such window. Worse, some users might recognize the `about:` URL scheme and believe the opened page to be an internal browser page.

I propose to add telemetry to track usage of `window.open` with an empty URL parameter. If usage will be low, I think that it might be worth considering deprecating this feature and requiring a non empty URL parameter.