many things wrong with tails but it is not the browsers fault
anyone breaking firefox will have an extensive hardware profile and easily determine your entry node, bssid, mac and by running traffic correlation (3-letter now knows the entry) determine exactly who you are connecting from and all this without a root exploit just by breaking the TBrowser
nothing new really has been there since the beginning which is why tails doesn't even come close to whonix/qubesos which make this inherent insecurity a lot harder to exploit
nothing new really has been there since the beginning which is why tails doesn't even come close to whonix/qubesos which make this inherent insecurity a lot harder to exploit