1522528 - Disable anialiasing while privacy.resistFingerprinting=True

Status: NEW

(Core :: Graphics, defect, P2)

Description

[Gary Chen [:xeonchen]]

Attachment: 0001-disable-antialiasing.patch

macOS has changed the antialiasing setting since 10.14 Mojave, which makes different PNG hash on [1] from 10.13 High Sierra.

[1] https://browserleaks.com/canvas

Comment 1

[Gary Chen [:xeonchen]]

In the WIP patch, it shows disabling antialiasing makes the PNG hash identical (59F2A850172F8F54A344303A64DABF19) between 10.13 and 10.14, but the patch itself is very expermental and need to find a better solution.

Comment 2

[Tom Ritter [:tjr]]

When you say "macOS has changed the antialiasing setting since 10.14 Mojave" - do you mean that in 10.14; OSX performs anti-aliasing in a different way? Or that there is an antialiasing setting that behaves the same way on both 10.13 and 10.14 but it's now enabled in 10.14?

Comment 3

[Gary Chen [:xeonchen]]

(In reply to Tom Ritter [:tjr] (PTO) from comment #2)

When you say "macOS has changed the antialiasing setting since 10.14 Mojave" - do you mean that in 10.14; OSX performs anti-aliasing in a different way? Or that there is an antialiasing setting that behaves the same way on both 10.13 and 10.14 but it's now enabled in 10.14?

Actually I know this by reading [1], said that "Apple’s macOS Mojave disables subpixel antialiasing".
This gave the reason to try the approach.

[1] https://www.howtogeek.com/358596/how-to-fix-blurry-fonts-on-macos-mojave-with-subpixel-antialiasing/

Comment 5

[Tom Ritter [:tjr]]

Comment on attachment 9344113 [details]
firefox Release 90.0.2

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Comment 7

[Tom Ritter [:tjr]]

Comment on attachment 9349723 [details]
firefox Release bugzilla

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