External link opens two windows in Firefox if it's not open.
If Firefox (72.0.2) is not open, clicking a link in other programs (FF is default browser on MacOS 10.15.3) 2 windows open.1= "Home" and 1 w/correct destination on top?
If Firefox (72.0.2) is not open, clicking a link in other programs (FF is default browser on MacOS 10.15.3) 2 windows open.1= "Home" and 1 w/correct destination on top?