Mozilla says that "many sites do not respect" Do Not Track requests, as they rely on voluntary compliance, adding that the feature may actually harm user privacy—likely alluding to the fact that it makes it easier for sites to fingerprint and track you. As such, as of Firefox version 135, Mozilla will disable the Do Not Track feature. As a replacement for the feature, Mozilla recommends using the more advanced "Tell websites not to sell or share my data" toggle built into Global Privacy Control, which it says is more widely respected and backed by law in some regions.

This is also just the latest in a long line of changes to both Firefox and web privacy, at large. For one, Google recently completely removed third-party cookies from its Chrome browser—a move it claims is in support of user privacy but has been widely criticized for putting Google in something of a monopoly position when it comes to tracking the data of Chrome users. Overall, the community feedback on Reddit seems to be either positive or indifferent, although one criticism of the new reliance on Global Privacy Control is that GPC doesn't block Google Analytics tracking requests, although the reasoning behind leaving Google Analytics in-tact is that many sites don't function correctly when it is blocked or disabled.