WebExtension windows.create API not working

[danfinlay]

• Did you search for similar issues before submitting this one?

Yes

• Describe the issue you encountered:

I develop a WebExtension that uses the windows.create API, but it does not seem to be working.

I'm unable to debug the specific cause because of a lack of an inspector.

• Platform (Win7, 8, 10? macOS? Linux distro?):

Mac OS 10.12.4

• Brave Version (revision SHA):

Brave 0.14.0
rev 215cba3

• Steps to reproduce:

  1. Install an extension that triggers a new window with some action (like MetaMask).
  2. Perform an action that triggers this new window creation (like initiating a transaction in MetaMask).

• Actual result:

No visible popup (could be related to popping up off screen).

• Expected result:

A visible popup.

• Will the steps above reproduce in a fresh profile? If not what other info can be added?

Yes

• Is this an issue in the currently released version?

Yes

• Can this issue be consistently reproduced?

Yes

• Extra QA steps:
  1.
  2.
  3.

• Screenshot if needed:

• Any related issues:

[jonathansampson]

Appears to be a dupe of #6789