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HTTP is the application-layer protocol that most web pages are transferred with. HTTP keep-alive connections can be re-used for multiple requests, as opposed to non-keep-alive connections, which are limited to one request. Using keep-alive connections improves performance. If a proxy server is configured, this preference controls whether to use keep-alive connections to the proxy server.

Possible values and their effects


Use keep-alive connections whenever possible. (Default)


Never use keep-alive connections.


  • This preference only has an effect if you are using a proxy. If you are not using a proxy, see network.http.keep-alive.

First checked in

2001-05-11 by Darin Fisher

Has an effect in

  • Netscape (all versions since 6.1)
  • Mozilla Suite (all versions since 0.9)
  • Mozilla Phoenix (all versions)
  • Mozilla Firebird (all versions)
  • Mozilla Firefox (all versions)
  • SeaMonkey (all versions)
  • Camino (all versions)
  • Minimo (all versions)

Related bugs

Related preferences

External links