alt Hacker NewsBut that's the key thing about tails. You start it fresh every time from a clean usb stick or iso image.
It's more than a browser restart, it's a complete system wipe every time.
Tails is made on the premise that exactly this kind of trick will occur. Sometimes even persisting between browser restart. For that reason even the persistent storage is very limited. But that's optional and cautioned against for maximum anonymity.
What would be worrying with tails would be if there was some way for some hardware identifier to be exposed. Like a serial number or MAC address. But this kind of thing is exactly what it's made to protect against.
Nice, yes, a fresh Tails restart would definitely teardown the Fox process. And I think if you're disciplined, then purely ephemeral environments are the best mitigation for process-level state leaks like this IndexedDB ordering bug.
For those who want an ephemeral setup but prefer the Chromium engine over Firefox, you can achieve a similar "destroy after use" workflow using BrowserBox. It has a tor-run function that connects Chrome to a Tor SOCKS proxy and wraps all auxiliary network calls over torsocks.
You can easily spin up a purely ephemeral session using a GitHub action [0] so that absolutely no state persists once you close it. As a bonus, you can also run the BrowserBox instance itself as an onion hidden service while browsing over Tor.
[0]: https://github.com/marketplace/actions/browserbox