Disabling the DNS cache of Mozilla Firefox

Last update on October 29, 2009 07:54 AM by jak58
Published by jak58

Disabling the DNS cache of Mozilla Firefox








The Firefox web browser contains its own DNS cache independent of your operating system. For most users, it is quite convenient, it allows a faster web browsing as it doesn't have to request for DNS at each connection to recently visited websites.

This could be very troublesome when you wish to set up manually the IP address of a server (e.g. to test purposes via the host file).

To disable the DNS cache:
  • Open your browser:
  • Type in about:config in the address bar.
  • Right click on the list of Properties, select New > Integer in the Context menu

  • Enter network.dnsCacheExpiration as the preference name and 0 as the integer value
  • When disabled, Firefox will use the DNS cache provided by the OS.
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