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This preference controls whether chrome errors and warnings are logged to the JavaScript Console.

Possible values and their effects


Show errors and warnings from both content and chrome. (Default in Mozilla Suite, SeaMonkey, Minimo, Calendar, and debug builds of Firefox)


Show errors and warnings only from content. (Default in Firefox)

Recommended settings

Extension developers and hackers should have this preference set to true.

First checked in

2002-02-26 by Blake Ross.

Has an effect in

  • Netscape (all versions since 7.0)
  • Mozilla Suite (all versions since 0.9.9)
  • Phoenix (all versions)
  • Firebird (all versions)
  • Firefox (all versions)
  • Thunderbird (all versions)
  • Calendar (all versions)
  • Minimo (all versions)
  • SeaMonkey (all versions)

Related bugs

Related preferences

See also