Browser.cache.check doc frequency

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When a page is loaded, it is cached so it doesn't need to be downloaded to be redisplayed. If the page changes after a previous visit, you may want to redownload it anyway to get the updated page. This preference controls how often to check for a newer version of a cached page.

Possible values and their effects


Check for a new version of a page once per session (a session starts when the first application window opens and ends when the last application window closes).


Check for a new version every time a page is loaded.


Never check for a new version - always load the page from cache.


Check for a new version when the page is out of date. (Default)



Mozilla Suite

Edit -> Preferences -> Advanced -> Cache -> Compare the page in the cache to the page on the network:

  • Once per session
  • Every time I view the page
  • Never
  • When the page is out of date

First checked in

Present since at least 1998-03-27.

Has an effect in

  • Netscape (all versions since 6.0)
  • Mozilla Suite (all versions)
  • Phoenix (all versions)
  • Firebird (all versions)
  • Firefox (all versions)
  • Thunderbird (all versions)
  • Minimo (all versions)
  • SeaMonkey (all versions)

Related preferences