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HTTP is the application-layer protocol that most web pages are transferred with. The total number of HTTP connections the application can make to a single server is limited by this preference. If more connections are needed, they are queued until a connection "slot" is available.

Possible values and their effects

This preference takes values between 1 and 255 inclusive, directly corresponding to the maximum number of HTTP connections Mozilla can have open at once. (Minimo default: 2. All others default: 8. Firefox 3: 15)


  • If you are using a proxy, the proxy server - not the server the content is coming from - is the server affected, so this effectively limits the maximum number of total connections.
  • The maximum number of connections to all servers is controlled by network.http.max-connections.

Recommended settings

If you experience problems not being able to download multiple files from a site, you can raise this value. It is, however, considered poor etiquette to make too many connections to a server and may lead to you being banned from that server.

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