After installing Firefox Developer Edition using the Aurora PPA method on 16.04 I dragged the icon from Activities to the launcher sidebar for handy access. But when I click that I get a 2nd firefox icon appear in the sidebar:
And every time I click the icon I added I get a new window. How can I get it to behave normally (i.e. when clicked it would display an already running firefox, or if there isn't one, start one)?