Help me understand tor with SSL?

[Juliusz Chroboczek]

>   Using privoxy is necessary because 
>   browsers leak your DNS requests when 
>   they use a SOCKS proxy directly,
>   which is bad for your anonymity. 

Firefox should in principle not use the DNS if

  network.proxy.socks_remote_dns

is set to true (in about:config).

>   Privoxy also removes certain 
>   dangerous headers from your web 
>   requests, and blocks obnoxious ad 
>   sites like Doubleclick.

This is better done in the browser, for quite a few reasons, including
the fact that there is no way a proxy can do that for SSL connections.

                                        Juliusz