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Firefox 145 adds anti-fingerprinting defenses

Security Tool/Service
First reported
Last updated
Happening score
H score 10
1 unique sources, 1 articles

Summary

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Mozilla’s Firefox 145 adds stronger anti-fingerprinting defenses, reducing exposure to persistent cross-site tracking. The protections start in Private Browsing Mode and ETP Strict mode, then expand to default activation after testing and optimization. Phase 2 blocks font, hardware, touch, screen, and CPU-core probing, cutting unique fingerprinting to 20% of users.

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Timeline

  1. 11.11.2025 00:25 2 articles · 6mo ago

    Firefox 145 privacy upgrade announced

    Initial Disclosure

    Mozilla announced Firefox 145 privacy upgrades that strengthen anti-fingerprinting defenses, with the new protections initially limited to Private Browsing Mode and Enhanced Tracking Protection (ETP) Strict mode before later default activation after testing and optimization. The Phase 2 controls add readback noise for background images, block local fonts except key language fonts, normalize touch support, reduce available screen resolution by 48 pixels in height, and report processor cores as 2, cutting persistent fingerprinting to 20% of users.

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  2. 11.11.2025 00:25 1 articles · 6mo ago

    Firefox 145 release day and packaging change

    Mitigation Patch Update

    Firefox 145 is scheduled to be officially released, and users can already download an installer from Mozilla’s FTP server. This release is also the first Firefox version without a 32-bit Linux build, which Mozilla deprecated because waning user demand no longer justified development and testing.

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