MDN’s new design is in Beta! A sneak peek:

Add-ons using the techniques described in this document are considered a legacy technology in Firefox. Don't use these techniques to develop new add-ons. Use WebExtensions instead. If you maintain an add-on which uses the techniques described here, consider migrating it to use WebExtensions.

From Firefox 53 onwards, no new legacy add-ons will be accepted on (AMO).

From Firefox 57 onwards, WebExtensions will be the only supported extension type, and Firefox will not load other types.

Even before Firefox 57, changes coming up in the Firefox platform will break many legacy extensions. These changes include multiprocess Firefox (e10s), sandboxing, and multiple content processes. Legacy extensions that are affected by these changes should migrate to WebExtensions if they can. See the "Compatibility Milestones" document for more.

A wiki page containing resources, migration paths, office hours, and more, is available to help developers transition to the new technologies.

This example shows how to style the scrollbars in your xul application. Scrollbars inside browser elements will be styled to. Tested on windows xp.

Example assumes a structure like this:


Copy the scrollbars.css from xulrunner/chrome/classic.jar/skin/classic/global to app/chrome/skin/global/scrollbars.css

Open the app/chrome/chrome.manifest and add:

skin app-global standard/1.0 skin/global/
override chrome://global/skin/xulscrollbars.css chrome://app-global/skin/scrollbars.css

xulscrollbars.css are used for windows xp, and nativescrollbars.css on osx. So to make this work with osx, make an extra override:

override chrome://global/skin/nativescrollbars.css chrome://app-global/skin/scrollbars.css

Change some color values inside the app/chrome/skin/global/scrollbars.css to test that the css is used.

Example xul window:

<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
<window id="sampleWindow" width="320" height="240"
<hbox flex="1">
   <browser type="content" src="" flex="1"/>
   <scrollbar orient="vertical"/>

Document Tags and Contributors

 Contributors to this page: bunnybooboo, wbamberg, fscholz, Ma gu
 Last updated by: bunnybooboo,