Dom.popup maximum

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To avoid a large number of pop-ups or a never-ending loop of pop-ups from a malicious site, Mozilla applications limit the number of pop-ups a non-click event is allowed to spawn. This preference specifies that limit.

Possible values and their effects

The number of pop-ups to allow from a single non-click event. (Default: 20).


  • Removing entries from this list may allow unwanted pop-ups; adding entries to this list may block legitimate pop-ups.

First checked in

2004-02-02 by Dan M

Has an effect in

  • Netscape (all versions since 7.2)
  • Mozilla Suite (all versions since 1.7a)
  • Mozilla Firefox (all versions since 0.8)
  • SeaMonkey (all versions)

Related preferences

Related bugs