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Firefox 72, an upcoming version of the web browser, may block so-called fingerprinters by default. Mozilla started to integrate and push Tracking Protection in the Firefox web browser in 2019. Designed to reduce tracking on the Internet, Tracking Protection blocks known trackers (e.g. social media trackers), cross-site tracking cookies, and other tracking related or undesirable content.

Standard tracking protection functionality is enabled in Firefox by default. Users of the web browser may adjust the protective feature by setting it to strict or custom. Strict and custom, the two other available presets, include protection against fingerprinters already.

Starting in Firefox 72, Firefox may block fingerprinters by default as well as part of the standard preset.

Mozilla added the blocking of fingerprinters to Firefox 72 Nightly and plans to test the integration. Based on the outcome of the test, fingerprinting protection may become a standard blocking feature in Firefox 72 Stable or be reverted.

Compatibility issues play a big part in the assessment of the feature. Some, legitimate, sites may break or functionality on legitimate sites may break, if fingerprinting is enabled. If the breakage is too severe, Mozilla may revert the decision.

Fingerprinting refers to methods that use data that is provided by the browser or user activity for tracking. All web browser reveal some information when sites are loaded. Information may include the user's location in the world, language settings, screen resolution, and other data. Sites may run scripts to gather more data. The main idea behind the data gathering is to generate a fingerprint based on the data to identify the user when the same or other sites are visited.

Mozilla explains the concept on its wiki website:

Quote:Fingerprinting is used to identify a user or user agent by the set of properties of the browser, the device, or the network, rather than by setting state on the device. For example, a party which infers the set of fonts a user has installed on their device and collects this information alongside other device information would be considered to participate in browser fingerprinting.

Tip: check out our master list of privacy tests that you may run to find out what your browser reveals about you.

Firefox users may control the browser's tracking protection feature in the following way:

1. Load about:preferences#privacy in the browser's address bar.

2. Switch between standard, strict and custom enhanced tracking protection levels. Custom allows users to configure protective features individually.

Firefox 72 is scheduled to be released on January 7, 2020.
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