privacy.resistFingerprinting set to true causes event.altKey to always return false
Categories
(Core :: Privacy: Anti-Tracking, defect)
Tracking
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| Tracking | Status | |
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| firefox68 | --- | affected |
People
(Reporter: jaws, Unassigned)
References
Details
STR:
Go to https://unixpapa.com/js/testkey.html and check the "Modifiers" option
Press Alt+D
See that altKey=true
Go to about:config, set privacy.resistFingerprinting=true
Go back to the testing webpage and press Alt+D again
Expected:
See that altKey=true
Actual:
See that altKey=false
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Reporter | |
Updated•6 years ago
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Reporter | |
Comment 1•6 years ago
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Looks invalid based on bug 1222285.
This issue is still present in 81.0.1 on Linux, can you please open it?
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Comment 3•4 years ago
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I believe that this is the expected behavior. When RFP is enabled, we spoof information relating to keycodes to prevent identification of keyboard layout. Are you saying we are not spoofing correctly; or that the keys aren't what you expected (because of the spoofing?)
Sorry for the noise, you can ignore my comment. I just realized this issue was closed as INVALID and not just resolved.
I'm not familiar with Firefox's codebase at all, but a comment [1] indicates the Alt can leak information about the keyboard layout, which I wasn't aware of.
[1] https://searchfox.org/mozilla-central/source/dom/events/KeyboardEvent.cpp#39-42
Description
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