Why fingerprint is same in private mode as well ?

[prk2331]

Team can you please give me a knowledge that why this is same in incognito mode as well, as last month I run the Sitecore Product there I saw the browser Id always different in incognito mode that time. and I am applying Fingerprint concept in my current project to identify anonymous guest, But while seeing this type of changing behavior in incognito mode I am little bit confused in both concepts.
Can anyone here who can guide me on this

Thanks

[prk2331]

In chrome + chrome incognito Fingerprint is not changing.
but as I saw in In firefox + firefox incognito Fingerprint is changing????

why this type of inconsitency ? is happening

[JuroUhlar]

Hi @prk2331!

FingerprintJS takes a large number of attributes from your browser (features, fonts, plugins, hardware parameters, etc., see the demo to get an idea) a hashes them into a single visitorId string.

These signals are the same in incognito mode as they are in normal mode, therefore FingerprintJS gives you the same visitorId (I just tested it in both Chrome and Firefox). Which version of Firefox are you using?

If you are trying to identify if a visitor is using incognito mode, FingerprintJS (the open-source library) does not have a field for this in the result, but Fingerprint Pro does. Developer plans are free for up to 20k identification requests per month.

[makma]

Hey @prk2331 ,
In general, we try to use only signals that are stable between normal and incognito modes. This results in the same identifier. Having said that, in some browsers/systems, this behavior might not be achieved just using the open source FingerprintJS and this feature is offered as is, without any guarantees.

[chitralverma]

can browser extensions like "privacy badger" cause the difference of behavior between normal and incognito modes ?

[JuroUhlar]

Hey @chitralverma I have tested Privacy Badger on the FingerprintJS demo here: https://fingerprintjs.github.io/fingerprintjs/
And got the same result in both normal and incognito mode (same for Fingerprint Pro). Privacy Badger seems to focus on third-party tracking, FingerprintJS allows you to identify visitors on your own site in a first-party context, there are no cookies to delete or requests to block.

[ezreall]

Why is the identifier on the same device and the same chrome platform? Just change the gmail account and the identifier will change. I also get another error in one case: gest mode chrome and edge default are generated together. same identifier

[JuroUhlar]

Hi @ezreall!

Why is the identifier on the same device and the same chrome platform?

Can you rephrase the question, please? I am not sure I understand

Just change the Gmail account and the identifier will change

Do you mean changing the Google profile signed in to the Chrome window? It can change the identifier but doesn't have to. For example, if the profiles have different preferred languages, they will have different identifiers. But if the profile settings are the same, they will have the same identifier. You can transparently check this behavior:

• open https://fingerprintjs.github.io/fingerprintjs/ in both profiles
• copy the two sets of Entropy components into https://www.diffchecker.com/text-compare/.

You will see which attributes differ between the two Chrome profiles.

I also get another error in one case: gest mode chrome and edge default are generated together. same identifier

Edge is using Chromium as a rendering engine under the hood, it is therefore expected that their browser fingerprints are the same (provided they have the same language settings, etc.). You could consider adding your own entropy components (like a user agent) to differentiate them.

FingerprintJS uses a simple and transparent hashing algorithm to generate the browser identifier. You can add or exclude individual entropy components according to your needs. But if its limitations are a problem for your use case, consider upgrading to Fingerprint Identification which has a much more advanced and accurate approach to browser identification built on top of FingerprintJS.

[Finesse]

Closing this because it's a question, not an issue, and it has been answered