Command-line help displays the proper help information, but only after components have been registered. If a component with a command-line handler is added, its help information will not display until the application has been run once without the "-help" parameter. This is because the help text is displayed before component registration occurs. Out of the box, all help information is displayed correctly due to the included component.reg file. http://bugzilla.mozilla.org/show_bug.cgi?id=26761#c80 http://bugzilla.mozilla.org/show_bug.cgi?id=26761#c81 reference: mozilla/xpfe/bootstrap/nsAppRunner.cpp DumpHelp()

Pretty sure this works now with the new commandline setup, though extensions are not displayed.