FF57 browser.windows.create() displays blank popup window

Hey add-on developers:
My add-on calls browsers.windows.create() api to display a popup. However after the recent FF57 updates, the popup shows up as blank. I have to either right click or drag&resize the popup for it to display the content.

Basically, this does not work correctly anymore in FF57:
browser.windows.create({
‘url’: ‘my-popup.html’,
‘type’: ‘popup’,
});

Currently I’ve seen this issue on WIndows7, Windows10, Ubuntu(14.04.5). However, the problem does not appear on MacOS(High Sierra).

Does anyone know if there is filed bug tracking this?

Thanks

Moved to addon/development section