open a url in cmdfile in private window
I have a cmdfile to open specific news websites in a private window. The syntax of the cmdfile line is
start "" "C:\Program Files\Mozilla Firefox\firefox.exe" -private-window %*
with a "timeout /t 2 /nobreak" call for a 2 secs pause between each to give things time to get going (firefox seems to trip up if I rush it with URLs using start command .. probably understandable).
This works, but all "windows" open in a new tab in the existing or initial private window instance. I want them to each open in their own instance of a private window. It seems to be behaving like the option -new-tab rather than a genuine new private window for each URL.
What option/s do I need to use to get a true new private window with just the specified URL open in a single tab for each URL I have coded?