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The preference javascript.options.showInConsole controls whether errors or warnings in chrome code are shown in the Error Console.

  • Type:boolean
  • Default value:  false (true in debug builds)
  • Exists by default: yes
  • Application support:Firefox 1.0
  • Status: Active
  • Introduction:2002-02-26
  • Bugs: bug 125181 bug 337875


Only errors and warnings from content code are shown.
true (default)
Errors and warnings from both chrome and content are shown in the Error Console.

Note: Since the Web Console was introduced in Firefox 4 specifically for debugging content, the default value for this preference has changed to true as of Gecko 2.0.

See also