OK, happy to help.
Quit confirmation: My concern with the current language is that it implies that open windows and tabs will be lost if you proceed with quitting, but in fact this depends upon your pref setting for "Orion opens with". Since it is small text, what I'm thinking is that the confirmation alert should reiterate what will happen to those open windows/tabs if you do quit.
If the pref for "Orion opens with" is either "new window" or "new private window":
You have X open windows containing Y tabs that will be closed.
If the pref is "all windows from last session":
You have X open windows containing Y tabs that will be restored when Orion reopens.
If the pref is "all non-private windows from last session":
You have X open non-private windows containing Y tabs that will be restored when Orion reopens. You have XX open private windows containing YY tabs that will be closed.
Ideally, in the last case, if there are no private windows the text would default to the previous case, not mentioning private windows at all because there aren't any.