: Tor browser will rely on more Rust code "Over the last few years, I've tried to report some of these profiling methods (and solutions) to the Tor Project, but each time has resulted in failure," he wrote."Often, my attempts to report a vulnerability or profiling risk has been met with silence." Even though the project asks on its website and Twitter for users to report security issues, when he has he has usually been met with silence. Krawetz stated how hard it is to report an error to the Tor Project. He added: "If the scrollbars are 15 pixels thick, then it's either Linux or Mac OS X (check the window height to distinguish Mac from Linux see issue #2). He then said that if you can detect the Tor browser - as possible in the first issue, and the scrollbars are 17 pixels thick, then you can work out that it's the Tor browser on Windows. The Tor browser on Linux uses scrollbars that are 10-16 pixels thick." The Tor browser on Windows 7/8/10 uses scrollbars that are 17 pixels thick. Krawetz pointed out the scrollbar thickness for a number of platforms, including: "The Tor browser on MacOS 10.11 uses a default thickness of 15 pixels. This can then be used to find out which operating system a user is on, as different OS's and desktops use different default thicknesses.
The browser does not normalise the viewport size, so if scrollbars are displayed then the viewport size can be subtracted from the windows size to find out the thickness of scrollbars. The third and last issue is to do with the scrollbar size in the Tor browser.
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