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Discussion on: Vulnerability allows cross-browser tracking in Chrome, Firefox, Safari, and Tor

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Nico Zerpa (he/him)

You guys have made a fantastic job. It's very clever, this exploit uses a security measure (the Same-origin policy) to violate the user's privacy.

I've tested the demo in the Brave browser. The exploit works in regular and private tabs, but this browser also has a "Private with Tor" mode. In this mode, the exploit fails because the browser blocks parts of the content in the popup.

(BTW, the Private with Tor mode in Brave is not as secure as the Tor Browser.)