Open new Fiefox browser instance but leave FR window open
Click the "Select mode" button while having the new FF instance as the latest focused window.
R: You get the dashed border, you can select stuff but the context menu does not open.
js error: contextMenu.openPopupAtScreen is not a function select.jsm:250
Steps to reproduce:
js error: contextMenu.openPopupAtScreen is not a function select.jsm:250