I'm a fan of GreatFire Analyzer, so I'm intrigued. But it's not clear to me what this library actually does. What kinds of censorship can it defeat? DNS poisoni

I'm a fan of GreatFire Analyzer, so I'm intrigued. But it's not clear to me what this library actually does. What kinds of censorship can it defeat? DNS poisoning, deep packet inspection, IP-based blocks? Do you direct traffic through your own servers or do you sneak past the Great Firewall in some other way? So many questions. All of that information should probably be somewhere in the readme.