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

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FF57 browser.windows.create() displays blank popup

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 S…