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Protocols (ex: http, ftp, mailto) are different methods of sending information over the Internet. Protocols may be handled by Mozilla applications themselves, or they may be passed to external applications, or they may not be handled at all. This preference controls whether to warn the user before opening an external application for protocols where a more specific network.protocol-handler.warn-external.(protocol) is not set.

Possible values and their effects


Give the user a chance to cancel before passing the data to the external application.


Pass the data to the external application without warning the user.

First checked in

2004-10-25 by Daniel Veditz

Has an effect in

  • Netscape (all versions since 8.0)
  • Mozilla Suite (all versions since 1.7.5)
  • Mozilla Firefox (all versions since 1.0)
  • Mozilla Thunderbird (all versions since 1.0)
  • Seamonkey
  • Sunbird

See also

Related bugs

Related preferences