Political Persecution and Internet Security

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So, /pol/, it has come to my attention that 4chan may be under surveillance. Particular cookies are being placed into our computers, and they give those on the other side access to our computers, posts, thoughts, documents, etc.

Here's my question: How do we protect ourselves from this?
>What are the best browsers to protect from surveillance?
>What plug-ins are useful to protect us?
>Are there any other things we can do to hide our identities?

Mods shouldn't delete this post. I am not trying to evade 4chan moderators. I am trying to get protecting from third-parties who may be illegal surveilling my computer and the computers of other /pol/tards.