Like edgy, or sharp.
Then set a different one 
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Found it. Not quite sure if it's the same as TailsOS. But it does offers similar features as TailsOS. Such as, an isolated one time windows environment. And when the session is closed, everything is erased.
That's (at best) like running an OS inside a VM. If your host OS is compromised, the client gets compromised too. And, unlike Tails OS, it doesn't run all connections through Tor.