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Mozilla 1.8
Type: boolean
If true, the element may be used as one that modifies a preference in a prefwindow. The preference attribute may be used to connect to a preference element. This is useful for custom elements implemented in XBL. The element should fire change, command, or input event when the value is changed so that the preference will update accordingly.

See the pref system documentation for more information.

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 Last updated by: Sheppy,