Firefox to add Tor Browser anti-fingerprinting technique called letterboxing

Re:Firefox to add Tor Browser anti-fingerprinting technique ... by oftenwrong on Wednesday March 06, 2019 @08:22PM (#19324787)

The browser could pick a fake screen size, and behave in a way that is consistent with that fake screen size. This would probably break many sites, but it would mitigate fingerprinting if a common size was used.

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Re:Firefox to add Tor Browser anti-fingerprinting technique ... by pmoriarty on Wednesday March 06, 2019 @09:10PM (#19324999)

This solution is just begging for side-channel attacks.

Firefox had better make sure its timing is not affected by such shenanigans, for instance.

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Re:Firefox to add Tor Browser anti-fingerprinting technique ... by oftenwrong on Thursday March 07, 2019 @05:39AM (#19327016)

I doubt that is avoidable, as the browser would still probably need to render at the false viewport dimensions. For a common adversary, fingerprinting based on timing would be more involved and less useful.

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