Mozilla has announced its decision to remove the Do Not Track feature from Firefox starting with version 135. This feature allowed users to request that websites not track their activity.
The decision to remove the feature was made due to the poor performance of the feature, as many sites did not respect this setting. Moreover, in some situations, transmitting the DNT header leads to a decrease in privacy. It could be used as an additional indirect identification feature in passive mode. The trackers also use for that screen resolutions, a list of supported MIME types, specific parameters in headers ( HTTP/2 and HTTPS ), installed plugins and fonts, availability of some Web APIs, video card-specific rendering features using WebGL and Canvas, CSS capabilities , and mouse and keyboard features.
Previously, Do Not Track could be enabled in Firefox settings under Privacy & Security by checking the corresponding box. In private browsing mode, the feature was automatically enabled.
Mozilla recommends using the setting "Do not allow websites to sell or share my data." It is based on the Global Privacy Control (GPC), which is supported by law in some regions and helps limit the transfer of user data to third parties. Unlike Do Not Track, GPC is a more powerful tool.
The new version of Firefox will place greater emphasis on other privacy protections, including SmartBlock technology, which blocks trackers without affecting the functionality of websites.
Mozilla encourages users to familiarize themselves with the capabilities of Global Privacy Control and offers additional tips for protecting their privacy.
Firefox 133 stable was released in late November 2024 with improvements and updates, including Bounce Tracking Protection and support for displaying tabs from other devices in the Tab overview menu.
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