Mozilla Used Mythos to Fix 271 Firefox Bugs

Hopefully one of them is this bug.

https://-fingerprint-com/blog/firefox-tor-indexeddb-privacy-vulnerability/

Fingerprint

We Found a Stable Firefox Identifier Linking All Your Private Tor Identities

We discovered a privacy vulnerability in Firefox Private Browsing and Tor Browser that allows websites to fingerprint and track users across origins using IndexedDB database ordering, even after closing all private windows.

We found a stable Firefox identifier linking all your private Tor identities