I’ve just been playing around with https://browserleaks.com/fonts . It seems no web browser provides adequate protection for this method of fingerprinting – in both brave and librewolf the tool detects rather unique fonts that I have installed on my system, such as “IBM Plex” and “UD Digi Kyokasho” – almost certainly a unique fingerprint. Tor browser does slightly better as it does not divulge these “weird” fonts. However, it still reveals that the google Noto fonts are installed, which is by far not universal – on a different machine, where no Noto fonts are installed, the tool does not report them.
For extra context: I’ve tested under Linux with native tor browser and flatpak’d Brave and Librewolf.
What can we do to protect ourselves from this method of fingerprinting? And why are all of these privacy-focused browsers vulnerable to it? Is work being done to mitigate this?
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Quite a lot actually. A lot of articles / blogs / news sites are actually more usable without javascript than with, because none of the annoying popups and shit can load. I suggest having two browser profiles: one with javascript enabled by default, and one with javascript disabled. So for things like online shopping, you’d open the js profile. And for things where you expect to do a lot of reading, use the nojs profile. Ublock origin also lets you temporarily enable/disable js for a particular website pretty easily.