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Service Workers are a thing.

If you're extra extra paranoid, use a disposable VM in Qubes OS.

https://www.qubes-os.org/doc/how-to-use-disposables/



Wait—service workers can keep running after a tab is closed?!


Maybe or maybe not, depending on browser implementation. They can be kept in memory if the browser sees no memory need.

But they might store stuff to localStorage. Right - localStorage is also a thing. And so are cookies.


Or just open it in private browsing?


Or disable service workers




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