Both browsers also send browsing data via the search autocomplete function. That's because both browsers send unique identifiers linked to the device being used, which are strong identifiers that cannot be changed. 'From a privacy perspective Microsoft Edge and Yandex are much more worrisome than the other browsers studied,' Leith wrote. Clear and publicly available practices and processes reinforce our commitment to putting users' needs first,' the spokesperson said. 'By limiting collection and retention of data and safeguarding the data users do share with us through encryption and anonymization, Firefox works to protect people's privacy and provide a secure browsing experience. Those functions can be disabled in Firefox's settings.Ī Mozilla spokesperson told Business Insider that the company only collects users' browsing history if their settings are set to enable 'syncing' in accordance with its public data practices, and that Firefox collects some other anonymized 'technical data.'

Firefox's push notifications feature also links users' browsing sessions to a different unique identifier, enabling more tracking. The study found that Firefox tags users' data with a unique identifier and sends browsing data back to Mozilla's servers. The Firefox logo is seen at a Mozilla stand during the Mobile World Congress in Barcelona Account icon An icon in the shape of a person's head and shoulders.

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