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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. The preferences network.http.max-persistent-connections-per-server and network.http.max-persistent-connections-per-proxy define the maximum number of keep-alive connections that can be open at one time. This can cause a problem - if the keep-alive connections made are long-lived connections (large downloads), then short-lived connections won't be allowed to connect because the maximum number has already been reached. The solution is to allow the maximum number of keep-alive connections to be exceeded after a certain period of time. This preference controls that amount of time.

Possible values and their effects

Number of seconds keep-alive connections must wait before they are allowed to exceed the maximum. (Default: 10)


First checked in

2001-09-04 by Darin Fisher

Has an effect in

  • Netscape (all versions since 7.0)
  • Mozilla Suite (all versions since 0.9.4)
  • 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