how to disable dns cacheing in firefox

  • open the location about:config

  • search for: network.dnsCacheExpiration

  • if found, change it’s value to 0

    • btw, the default is 3600

  • if not found:

    • right-click on an empty spot in the page

    • select New from the popup menu

    • select Integer as the type

    • enter network.dnsCacheExpiration as the name

    • enter 0 for the value