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Mozilla Firefox Will Block Web Trackers by Default

MMS Founder

Article originally posted on InfoQ. Visit InfoQ

Mozilla recently announced that Firefox will block web trackers by default in a near future. Mozilla Firefox wants to protect users from websites that abuse of trackers, improving both performance and privacy and for that plans to release a series of features through three key initiatives, including improving page load performance, removing cross-site tracking, and mitigating harmful practices.

One of the big problems on website loading performance are web trackers, which are mainly used for targeted advertising and broad user data collection. Earlier this year, General Data Protection Regulation (GDPR), a regulation on data protection and privacy for all individuals within the EU went into effect. As websites started to comply with the wide-reaching data privacy regulation, developers quickly observed significant benefits in page load performance.

In a study by Ghostery, 55.4% of the total time required to load an average website was spent loading third-party trackers, and even worse for users on poor connections. To improve page load performance, a new feature to block trackers that slow down page load has been added to Firefox Nightly, according to Mozilla, this feature will be in test using a shield study (shield studies let users try features before they are release to all Firefox users) in September, and if the tests perform well, this feature will be available in Firefox 63.

Removing cross-site tracking that follow users around the web is also available in Firefox Nightly, this feature will strip cookies and block storage access from third-party tracking content. According to Mozilla some Firefox beta users should test it in September in a shield study, and if the tests perform well, this feature will be available in Firefox 65.

Harmful practices that invisibly collect identifiable user information or degrade the user experience, unfortunately, are common nowadays. For example, trackers that fingerprint users (to identify users by their device properties, and which users are unable to control), or sites that deploy cryptomining scripts that silently mine cryptocurrencies on the user’s device. At this moment, the version of Firefox that will stop these practices are not known.

Apple too will provide “Intelligent Tracking Prevention” (ITP) 2.0 for Safari 12, which aims to reduce the ability of third-parties to track web users via cookies and other methods.

Users who want to try these protections, should download Firefox Nightly, then from Control Center menu (left-hand side of the address bar), there is a new section “Content Blocking”.

(image taken from the

From here, users can enable the blocking of slow-loading trackers or cross-site tracking through third-party cookies by clicking “Add Blocking…” next to the respective option. Check “Slow-Loading Trackers” to improve page load performance, and check “Third-Party Cookies” and select “Trackers (recommended)” to block cross-site tracking cookies.

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