> it would require them to think through an open, stable & forever-supported API... Where only would we find such a unicorn? I copied Firefox to %programfiles

> it would require them to think through an open, stable & forever-supported API... Where only would we find such a unicorn? I copied Firefox to %programfiles(x86)%\Microsoft\Edge\Application and renamed its executable to msedge.exe. It confuses Firefox whether it set as standard browser or not at first, but otherwise works like a charm. Will probably be killed through the occasional update, but what isn't these days.