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

Question

I'm playing with XUL and modules ( https://developer.mozilla.org/en-US/docs/Mozilla/JavaScript_code_modules/Using )
I've defined a 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 is loaded from 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 I click on the button, I see in the jsconsole :
Hello !
4
Error: TypeError: Hello.open is not a function
Source File: chrome://hello/content/main.js
Line: 14
why does xul know about Hello.incr but not about Hello.open ?
update: code is available here: https://github.com/lindenb/xul-bootstrap

Answer 1

ok, got it: XUL-Runner caches some files under ${HOME}/${VENDOR}
It silently ignored my changes and used the old file in the cache.
See XULRunner ignores updates on edited files