False-positive alerts on websites

Users who use privacy tools to change Browser Fingerprint often visit browser fingerprint checker sites like:

They are really good websites where you can check the values of the different parts of your browser fingerprint. We recommend the whoer.net and for canvas the browserleaks.comThe problem is that these sites are rating your fingerprint configuration and that confuses many users. Here is a little guide on how to handle the information provided by these sites.

The good news is that often they are false positive alerts. It means that you don’t have to worry despite there are signs on the sites about it. Lets see the details:

On the picture below you can see a screenshot taken on the f.vision website while browsing with a Swedish Chrome Browser with Kameleo v1.5.


As you can see this website alerts that there is a problem with Language and Platform. We can assure you that you don’t have to worry about it. This site is making a false positive alert. It means that it is rating your browser fingerprint based on a bad algorithm. Our Base Profiles are harvested with big care so they look natural. They look exactly how real browser configurations so they can keep you undetected. This website is alerting because it’s alert system is implemented wrongly. The only fingerprint that can get a "100% classification" here is fake browser profiles that are generated with their own product. (But they are detected by real security software)

We can prove that it is a false positive alert!

We created a couple of more screenshots with this profile on other sites:


On Whatleaks.com both the Platform and the language look consistent.


There is no problem with the user agent either.

It is just the question of implementation

The implementation of these browser fingerprint websites is different. The screenshot below shows whoer.net with the same profile. There is no problem there. The profile is rated with 100% anonymity.


On one site it alerts because Header Language value is not exactly the same as the javascript language value. (Based on string comparison). That is a bad implementation. As you can see that on the header it says ‘se‘ on javascript it says ‘sv-SE‘. Both means Swedish but f.vision fails on this comparison and makes a false positive alert.

Still not believe it?

I suggest you open these sites with your real browser with your real PC. There is a big chance that it will still warn you with a false positive alert. Like for me.


The above screenshot was taken with my normal PC with no spoofing and it still gets problems.

Imagine that a real site’s browser fingerprint detection system works the same way as this. It would mean that I couldn’t use the website with my regular PC.

To summarize

Don’t panic if a website like f.vision is showing some false positive alert. The real thing that matters is the success rate you get. And we can assure you that it is pretty high with Kameleo.

If you really want to check the rate of your browser fingerprint we recommend using whoer.net for general stuff and browserleaks.com for canvas. But we recommend to read the articles of the Browser Fingerprinting Technologies category in our knowledge base so you will understand things more.


See this related video about not getting 100% anonymity

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