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http://l3tczdiiskhzezq44sv3qz4vqbnpgfh74tls77puyycqmjn6w5bri4yd.onion/man-page/privoxy-man-page.html
Privoxy can only proxy HTTP and HTTPS traffic. Do not try it with FTP or other protocols. HTTPS presents some limitations, and not all features will work with HTTPS connections. For other browsers, check the documentation.