xulrunner - XUL + javascript module : TypeError: xxx.yyyy is not a function -

i'm playing xul , modules ( https://developer.mozilla.org/en-us/docs/mozilla/javascript_code_modules/using )

i've defined small module: under hello01/chrome/content/js/hello.jsm

this.exported_symbols = ["hello", "foo"];  function foo() {   return "foo"; }  var hello = {   name : "bar",   size : 3,   incr : function()     {     this.size++;     return this.size;     },   open : function()     {     return this.incr();     } }; 

this module loaded hello01/chrome/content/main.js

components.utils.import("chrome://hello/content/js/hello.jsm");  function jsdump(str) {   components.classes['@mozilla.org/consoleservice;1']             .getservice(components.interfaces.nsiconsoleservice)             .logstringmessage(str);     }  function showmore() {   document.getelementbyid("more-text").hidden = false;   jsdump("hello!");   jsdump(hello.incr());   jsdump(hello.open()); } 

from xul window:

(...) <button label="more >>" oncommand="showmore();"/> (...) 

when click on button, see in jsconsole :

hello ! 4 error: typeerror: hello.open not function source file: chrome://hello/content/main.js line: 14 

why xul know hello.incr not hello.open ?

update: code available here: https://github.com/lindenb/xul-bootstrap

ok, got it: xul-runner caches files under ${home}/${vendor} silently ignored changes , used old file in cache. see xulrunner ignores updates on edited files