Sniffly2

Sniffly2 is a variant of Sniffly which abuses HTTP Strict Transport Security headers and the Performance Timing API in order to sniff your browsing history in Chromium-based browsers.

Demo

Visit http://diracdeltas.github.io/sniffly in Chrome/Chromium/Brave/etc. with HTTPS Everywhere disabled.

Caveats:

• does not work on mobile or Firefox
• does not work over HTTPS due to mixed content blocking.
• adblockers may taint results

Acknowledgements

• crbug436451, reported by [email protected], for the idea of probing port 443 over HTTP
• Scott Helme for providing an initial list of HSTS hosts