From MozillaZine Knowledge Base
Jump to navigationJump to search


DNS prefetching was implemented in Firefox 3.5 to improve page load time. This feature allows Firefox to perform domain name resolution proactively and in parallel for hyperlinks, images, CSS, JavaScript, and other webpage content. [1] [2] Note: To disable DNS prefetching using about:config you will need to add network.dns.disablePrefetch as a new boolean preference and set the value to true.

Possible values and their effects


Disable DNS prefetching


Perform DNS prefetching (Default)

First checked in

Nov 07 2008 by Patrick McManus

Has an effect in

  • Mozilla Firefox (nightly builds since 2008-11-07; 3.1b2 and above)

Related bugs

External links