From MozillaZine Knowledge Base

This is a page about the mozilla application suite. Why not put all the prefs that are associated with the application suite here. I think refering the user to Firefox stuff is just adding confusion. Especially since some of the prefs are not relevant to Firefox (or Thunderbird, for that matter). Mmcmonster 07:45, 23 May 2004 (PDT)

The Preferential extension website contains a list of prefs along with their descriptions. Some prefs only apply to just FireFox or just Mozilla Suite, but most apply to both.