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How to Access .onion Sites (Also Known as Tor Hidden Services)

Sites that use the .onion top-level domain are privacy-focused websites that are only accessible using the Tor network.

Tor browser's great - but for more complete privacy protection, you need to add this

When you use the Tor Browser, the only network traffic that's being masked is via the web browser. If you want more traffic anonymized and encrypted, you need to take a different approach.