Be careful with old versions!
These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.
every extension, witch modifies/extends the js-console ("chrome://global/content/console.xul"), will be affekted . every other extension-window (venkman, ...) will not.
it just avoids toggeling between browserwindow and consolewindow. you will immediately see every upcomming errormessage.