XPI installation

"Black Banana" <[email protected]> Tue, 16 Nov 2004 11:43:38 +0100
Newsgroups gmane.comp.mozilla.devel.xpinstall
Organization Another Netscape Collabra Server User
Message-ID <[email protected]>
    MyApp.xpi file have to be on Mozilla.org web site or user have to edit 
Mozilla browser settings (to add my web site) or .xpi file have to be on the 
local disk. Is there any other option to install .xpi files? Like signing of 
.xpi files?