"One of the new features that Mozilla introduced in Firefox 4 is
a Do Not Track (DNT) setting. When the user enables the DNT option
in the browser's preference dialog, Firefox will transmit a custom
header in HTTP requests that will inform servers that the user
wants to opt out of Internet tracking. The concept has obvious
merit because it provides a simpler, more predictable, and more
consistent approach than the cookie-based mechanisms that are
currently used today to signify opt-out status.
"The downside of Mozilla's system is that it would be completely
ineffective without buy-in from the major advertisers. Despite the
fact that it wouldn't actually do very much, Mozilla offered the
setting in Firefox 4 with the hope that it would help build
momentum for the superior opt-out mechanism. Its decision to do so
seems to have been vindicated. In an announcement, Mozilla revealed
that the DNT header is starting to gain high-profile
Some of the products that appear on this site are from companies from which QuinStreet receives compensation. This compensation may impact how and where products appear on this site including, for example, the order in which they appear. QuinStreet does not include all companies or all types of products available in the marketplace.