Does this apply even for people who have not flipped
`privacy.fingerprintingProtection`? And do we have a sense of how many
websites would be affected in terms of actually displaying differently
as a result?
~ Gijs
On 28/08/2023 10:06, Tim Huang wrote:
We intend to enable font visibility restrictions in private browsing
windows from Fx118. To reduce entropy exposed by fonts, we restrict
the visibility of fonts to websites. The protection prevents websites
from accessing all non-system and non-langpack fonts.
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1849903
Standard: n/a
Platform coverage:
It apply on all desktop platforms, including Windows, Mac, and Linux.
We won't cover Android momentarily, but we are working on it.
Preference:
The font visibility restrictions in PBM is behind the pref
"privacy.fingerprintingProtection.pbmode". We will set this pref to
true to enable this protection in private browsing windows. For normal
windows, there is another pref called
"privacy.fingerprintingProtection" to control the behavior.
This feature was previously discussed in this "Intent to prototype"
thread:
https://groups.google.com/a/mozilla.org/g/dev-platform/c/tKOOrYXDoHA/m/X4mj4nc-AgAJ
More information can be found there.
--
Tim Huang
Mozilla
email:[email protected]
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