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When a Mozilla application starts up or creates a new window, this preference is consulted for a chrome URL to be used for the window.

Possible values and their effects

A chrome:// URL to be loaded when Mozilla starts as the application chrome, and to be used when new windows are created. The default is chrome://browser/content/ for Firefox and chrome://navigator/content/navigator.xul for Mozilla Suite/SeaMonkey.


  • Setting this preference incorrectly can break your browser, preventing any new windows from appearing until it is set back. Use caution when modifying its value.

First checked in

2000-04-25 by Dan Matejka

Has an effect in

  • Mozilla Suite (all versions since M16)
  • Mozilla Firefox (all versions)
  • Mozilla Thunderbird (all versions)
  • SeaMonkey (all versions)

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