How to open the Command Menu in Dev Edition?

You can open the Command Menu on other browser (e.g. Chrome) when you press Ctrl + Shfit + P
On Firefox those key combos open up the Incognito. So how can I open the Command Menu in Firefox ? (I’m using Dev Edition btw)

We don’t have a Command Menu yet.
This is tracked by https://bugzilla.mozilla.org/show_bug.cgi?id=1603713