DNS Prefetch Prefetches DNS lookups to speed up browsing (à la Google Chrome).
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DNS Prefetch Description

Prefetches DNS lookups to speed up browsing (à la Google Chrome). DNS Prefetching is a Firefox extension that speeds up your browsing experience by resolving and caching DNS lookups before you actually click on a link. Without this technique, the DNS lookup is performed only when you click on the link, adding a wait of 250ms (on average) before the page even starts to show up.DNS Prefetch does not try to resolve relative links, or resolve links whose host is the same as the current page's host, since the current site's DNS record is almost certainly already cached. DNS lookups are performed asynchronously, after the page has loaded, so that your browsing experience is never delayed or interrupted.Your privacy is safe. While DNS Prefetch does perform a DNS lookup for each different site that exists in a link on your current page, it does not connect to those sites or download any data from them. Unlike page prefetching, the only servers contacted are your computer's DNS servers. Requirements: · Mozilla Firefox What's New in This Release: · DNS Prefetch for Firefox 1.5 - 3.0 now follows all the standards for prefetch control used by Chromium (http://dev.chromium.org/developers/design-documents/dns-prefetching) and Firefox 3.5 (https://developer.mozilla.org/En/Controlling_DNS_prefetching). · For users, this means that the behavior of DNS Prefetch can be controlled by entries in your about:config page. If you wish to disable prefetching, you may set the network.dns.disablePrefetch preference to true. Also, by default, prefetching of web links is not performed on documents loaded over HTTPS. This can be changed by setting the network.dns.disablePrefetchFromHTTPS preference to false. Changes to these settings take effect immediately. · For web developers, this means DNS Prefetch now includes support for the X-DNS-Prefetch-Control HTTP header and meta tag, tags with relation attribute of "dns-prefetch", and hrefs that specify only the domain name (as in href="//sample.com"). Meta tags placed in the body to change the prefetching policy within the page (as in Chromium's examples) are not currently supported, as Gecko moves all meta tags into the head before exposing the DOM to JavaScript.

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