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Asked: 2026-05-23T01:43:40+00:00

I am trying to create a XUL Hello World application in Mac OS X.

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I am trying to create a XUL “Hello World” application in Mac OS X. I download the XULRunner from here, followed this tutorial and then this tutorial and then this tutorial… None worked. So, I looked at it better and found this section, whose instructions I followed. Unfortunately, it does not work yet. I even can run the application with the command

/Library/Frameworks/XUL.framework/xulrunner-bin $PWD/application.ini

However, no window is presented and no error is printed. It happens when I try to run the application with firefox -app too.

What can be wrong? Also, does someone know some tutorial which would work? It would be an acceptable answer, too 🙂

Thanks in advance!

File contents

The content of the application.ini file is:

[App]
Vendor=Me
Name=Zull
Version=1.0
BuildID=31052011
ID=zull-xul@zull.com

[Gecko]
MinVersion=2.0
MaxVersion=2.*

The content of chrome/chrome.manifest is:

content zull file:content/

The content of chrome/content/main.xul is:

<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
<window id="main" title="My App" width="300" height="300"
    xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
    <caption label="Hello World"/>
</window>

Finally, the content of defaults/preferences/prefs.js is:

pref("toolkit.defaultChromeURI", "chrome://zull/content/main.xul");
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1 Answer

  1. Editorial Team

    Following the recommendations of Wladimir Palant, I changed the content of chrome/chrome.manifest from

    content zull file:content/

    to 

    content zull content/

    Then, following these instructions, I created a chrome.manifest file in the root app dir whose content is

    manifest chrome/chrome.manifest

    It is required because the default place for chrome.manifest in XULRunner 2.0 is the root app directory.

    However, the error No chrome package registered for chrome:///User/brandizzi/sandbox/zull/main.xul persisted. Then, I got it: trying to solve the problem, I experienced using the full path to the main.xul file in defaults/preferences/prefs.js:

    pref("toolkit.defaultChromeURI", "chrome:///User/brandizzi/sandbox/zull/main.xul");

    I just changed it to the chrome path…

    pref("toolkit.defaultChromeURI", "chrome://zull/content/main.xul");

    …and it worked.

    It was a bunch of silly errors nonetheless but it is solved now. This thread was very helpful to me. Also, Wladimir recommendation about using the -jsconsole option of XULRunner (such as in /Library/Frameworks/XUL.framework/xulrunner-bin ~/sandbox/zull/application.ini -jsconsole) was very useful.

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