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Firefox is adding profiles to separate your browsing sessions
(www.theverge.com)
This is a most excellent place for technology news and articles.
In Windows it's the same. Though the parameter is
-P(uppercase) not-p. That's why the comment said "it’s hidden behind a startup parameter".I dont know about Mac, but in Linux you can just manually make a
.desktopfile to have as a shortcut to callfirefox -P, or better a shortcut to a specific profile withfirefox -P <profile>. Though what I often do is keep a bookmark toabout:profilesand open a new window from there.