Popup window opens as blank using Firefox on iOS #19

Quite an edge case with using Firefox on iOS which leads to opening blank tab and not loading popup.location URL caused by async action in index.js:36

Related Firefox issue: Could not access window created using window.open('about:blank' .... code

Tested on: iPhone 6, iPad, FF 10.6 (8836).

Possible solution to open window with desired URL, unfortunately not possible within current use-case of opening popup first, and fetching token later in index.js.

Everything works perfectly on other devices/browsers, thanks @ivanvs.