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Kerberos is a authentication protocol. This preference determines whether to use SSPI or GSSAPI for Kerberos authentication.

Possible values and their effects


Use SSPI. (Default on Windows)


Use GSSAPI. (Default on other OSes)


  • SSPI only works on Windows.

First checked in

2005-08-17 by David Bienvenu

Has an effect in

  • Firefox (all versions since 1.5, Windows OS)
  • Thunderbird (all versions since 1.5, Windows OS)
  • SeaMonkey (all versions since 1.0, Windows OS)

Related bugs

Related preferences

External links