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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 determines whether a specific protocol that is already configured to be handled but whose behavior is not defined by a specific network.protocol-handler.external.(protocol) preference should be handled internally or externally.

Possible values and their effects


This protocol should be handled by an external application. (Default)


This protocol should be handled internally.


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