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→Chrome URLs
To maximize the flexibility, Mozilla introduces a new technology called "Configurable Chrome" (Refer to [http://www.mozilla.org/xpfe/ConfigChromeSpec.html Configurable Chrome] by Benjamin Smedberg <benjamin@smedbergs.us>). A XUL file can be written in such a fashion that its chrome description comes from a mixture of physical sources, either locally, remotely, or a combination of both. An end user may customize her/his configuration to pick up any of the source type from his favor chrome providers.
To achieve this, chrome type URLs must be used to reference external sources; such as CSS files and JavaScript files. A Chrome URL points to a file registered within the Mozilla product (it could be e-mail, calendar, browser etc.) The general form of chrome URLs look like this:
<pre>chrome://WindowType/ProviderType/[ProviderName/]</pre>
