If you are logging into any website, you should make sure that the site offers HTTPS encryption, which protects against this kind of eavesdropping. You can verify this in the URL bar: if your connection is encrypted, the address will begin with "https://", rather than "http://".

HTTPS-Only Mode in Tor Browser

HTTPS-Only mode forces all connections to websites to use a secure encrypted connection called HTTPS. Most websites already support HTTPS; some support both HTTP and HTTPS. Enabling this mode guarantees that all of your connections to websites are upgraded to use HTTPS and hence secure.

Some websites only support HTTP and the connection cannot be upgraded. If a HTTPS version of a site is not available, you will see a "Secure Connection Not Available" page:

If you click 'Continue to HTTP Site' you accept the risk and then will visit a HTTP version of the site. HTTPS-Only Mode will be turned off temporarily for that site.

Click the 'Go Back' button if you want to avoid any unencrypted connections.

Cryptocurrency safety

Tor Browser presents a security prompt if a cryptocurrency address has been copied from an insecure HTTP website. The cryptocurrency address could have been modified and should not be trusted. Clicking 'Reload Tab with a New Circuit' will attempt to load a secure version of the website with a new Tor circuit.

If you click 'Dismiss' you accept the risk and the cryptocurrency address will be copied to the clipboard.