Well, that's a hard problem to describe in one sentence. I'm currently using windows. I have 2 Firefox profiles, and each of them have desktop shortcuts to: "C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -no-remote -P "Developer" "C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -no-remote -P "Lazy" They work just fine. The thing is: if the profile is already active and I click the shortcut, I get a "Firefox already running but not responding" error (Firefox just fails to open. The current opened window still works). The behavior I want is either maximize/focus the corresponding window, or open a new window with the same profile. Is it possible to achieve this? What am I missing? I don't know if I'm being clear. In other words: - Desktop shortcut to specific profile works fine - While profile is open, double click the same desktop shortcut - Receive a "Firefox already running" error popup - Press ok, current profile still working but new window is not opened as expected