Oh, this is bad. Luckily, it was disclosed responsibly and is already fixed in latest #Firefox… and more importantly, #Tor browser. #indexeddb
https://fingerprint.com/blog/firefox-tor-indexeddb-privacy-vulnerability/

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.




