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→Chrome URLs
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[Refer to [http://xulplanet.com/tutorials/xultu/chromeurl.html XULPlanet - The Chrome URL] for more details]:
<pre>chrome://WindowType/ProviderType/[ProviderName/]</pre>