Use screen refresh rate as entropy

[v-0-d]

Check out:
https://www.testufo.com/
It will show you the screen refresh rate live.

This would add entropy even for those browsers that fake the screen resolution successfully.

[abrahamjuliot]

Thank you, that is pretty cool. There's an interesting discussion on this at #114. I will give this some thought. I'm interested in testing this more thoroughly on different devices.

[Thorin-Oakenpants]

FF can't report more than 60fps/60hz - it's capped

[tomrittervg]

FF can't report more than 60fps/60hz - it's capped

I'm not sure about that.

https://searchfox.org/mozilla-central/source/modules/libpref/init/StaticPrefList.yaml#7898-7904
and
https://searchfox.org/mozilla-central/source/gfx/thebes/gfxPlatform.cpp#2896-2903
and
https://searchfox.org/mozilla-central/source/gfx/thebes/gfxPlatform.cpp#2906

tell me that if your system can do more than 60Hz, and can tell Firefox it can do more than 60Hz - then we will at least try.

And RFP doesn't affect that AFAICT - at least until https://bugzilla.mozilla.org/show_bug.cgi?id=1692609 finally lands

[v-0-d]

I get 90hz on a pixel 5 with the latest tor browser on ufotest.

[Thorin-Oakenpants]

ahh, OK - I was thinking of #114 (comment) where I linked to your comment and took that to mean rAF cannot go above 60, but I guess I've misread the context (or rather than rAF is not being used in this PoC from OP) - IANAE :)

I think the argument against this is that rAF only gets called on a regular 60 times a second when operating at high speed. It'll never go faster than that. It will go slower.

[Thorin-Oakenpants]

I get 90hz on a pixel 5 with the latest tor browser on ufotest.

@v-0-d What do you get now on Nightly since 1692609 landed

• edit: with and without privacy.resistFingerprinting = true

for relevance, just read https://bugzilla.mozilla.org/show_bug.cgi?id=1772711#c1

[abrahamjuliot]

On my 75hz monitor, in Nightly, I get 75 fps. With RFP on, I get 49-60.

[Thorin-Oakenpants]

With RFP on, I get 49-60.

that's so 0xBADA55

[Thorin-Oakenpants]

FYI: https://bugzilla.mozilla.org/show_bug.cgi?id=1774247

[abrahamjuliot]

https://www.shadertoy.com/view/7ssyzr (GPU and OS detector+ fps)

RFP is stable at 60 fps