Recent answers to Help debugging popup windowshttps://support.mozilla.org/en-US/questions/12953792020-07-17T04:43:52-07:00Well I prettified the source and discovered the popup was actually caused by a form element created 2020-07-17T04:43:52-07:00jakob6https://support.mozilla.org/en-US/questions/1295379#answer-1333691<p>Well I prettified the source and discovered the popup was actually caused by a form element created and submitted from JavaScript. Still interested to hear if anybody knows how to intercept `window.open` popups though.
</p>