2013-04-03: It's not an April's fool (Part II)

    * version 3.7

    * Fix :preferences and some :dialog commands for recent Firefoxs

    * Compatibility fixes for Firefox 20

    * Make sure :dialog addons really opens a dialog instead of a tab

    * add -private option to :winopen and :window for Firefox 20+ PrivateBrowsing-per-window

    * Pushed minVersion to Firefox 17

    * Clear command history after returning from private browsing