🚨 Tor Browser opsec discovery: The security level slider cannot be relied upon without a full browser restart: https://www.privacyguides.org/articles/2025/05/02/tor-security-slider-flaw/

If you frequently switch between security levels in Tor Browser (or Mullvad Browser!), make sure you are fully restarting the browser every time, otherwise you could still unexpectedly have dangerous JS features enabled!

This requirement is not publicly documented anywhere. Hopefully @torproject will add a prompt to restart after modifying this setting in a future Tor Browser release.

#Opsec #TorBrowser #Security #MullvadBrowser #Privacy #PrivacyGuides #PSA