http://kbhcl3suo7mebwn5iamnncuopqlraqzygsuizubjvmtyiepe7j4xvlad.onion
Any online activity is connected with storing sensitive data like logins, passwords, private keys and mnemonics. TOR is no different in this matter. Just like there are lots of tools to keep your sensitive data for the clearnet activity, there is a tool designed especially for Tor - KeePassXC.