Fake deviceMemory not detected on Firefox

[JobcenterTycoon]

When i set the value with uBlock Origin with abrahamjuliot.github.io##+js(set, navigator.deviceMemory, 1) on Firefox the site doesn’t detect this fake and also clears my visits.

Firefox doesn’t support navigator.deviceMemory https://developer.mozilla.org/en-US/docs/Web/API/Navigator/deviceMemory

[abrahamjuliot]

Good catch. It's detected in console.log(Fingerprint.navigator.lied) but not shown in the top section. There exist several similar inline detections that can be displayed with a message. I believe we used the iframe mismatch detection to capture it, but your suggestion is better and straightforward.

You should get two different fingerprints, one clean and one wrong. The invalid one should not change if you rotate the memory via JS.

[JobcenterTycoon]

Yes 2 fingerprints and no change when i rotate. But a fake memory on a browser which don’t even support this should be just throwed away without affecting the final fingerprint or not?

[abrahamjuliot]

It's better to preserve the additional entropy if we can keep it stable. The existing lie is better entropy than a restored result. Maybe there are some use cases for restoring the original, but they will be limited to what we can restore.