[tbb-dev] TBB 6.0.5 / screen resolution and color depth

Georg Koppen gk at torproject.org
Fri Sep 23 08:43:00 UTC 2016

> Georg Koppen wrote on 09/22/2016 12:03 PM:
>> Spoofing the window consistently is probably not possible as there are
>> numerous ways to find out the dimensions of your actual window size.
>> Thus, making sure you get a properly rounded window size seems to be the
>> easier route to mitigate fingerprinting.
> where and how is this controlled though?  in a default firefox window,
> the test site reports back my actual screen resolution, no matter what
> size the window is.  it seems TBB is doing some spoofing somewhere but
> it is always returning the size of the window.  1000x500 is not a screen
> resolution used anywhere, so if TBB starts with a window size of
> 1000x500 we can almost be certain that it is a Tor Browser and not
> blending in with other clients

Tor Browser is doing no spoofing. It is resizing your actual window to
multiples of 200 and 100 on start-up and New Identity.


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