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The user can interact with a loading page when content.interrupt.parsing is set to true. When a page is loading, the application has two modes: a high frequency interrupt mode and a low frequency interrupt mode. The high frequency interrupt mode interrupts the parser more frequently to allow for greater UI responsiveness during page load. The low frequency interrupt mode interrupts the parser less frequently to allow for quicker page load. The application enters high frequency interrupt mode when the user moves the mouse or types on the keyboard and switches back to low frequency mode when the user has had no activity for a certain amount of time. This preference controls that amount of time.

Possible values and their effects

The number of microseconds (1 second = 1,000,000 microseconds) of inactivity that puts the application into low frequency interrupt mode. (Default: 750,000)


Recommended settings

Raising the value will make the application more responsive at the expense of page load time.

First checked in

2001-06-29 by Kevin McCluskey

Has an effect in

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

Related bugs

Related preferences