helloworld-tb@mozilla.doslash.org Hello World for Thunderbird 1.5 1.0 Classic first extension from MozillaZine KB Nickolay Ponomarev A person who helped you Another one http://kb.mozillazine.org/Getting_started_with_extension_development {3550f703-e582-4d05-9a08-453d09bdfdc6} 1.5 1.5.0.*