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The part about the browser is a bit too short.

If you are privacy conscious you should configure your browser to

a) block 3rd party cookies (all browsers except Safari have them enabled by default, even Firefox)

b) delete all cookies when the browser is closed.

Make it a habit to close the browser every now and then.

Self Destructing cookies plugin will delete them even more quickly

Tab cookies if you're on Chrome is a good alternative.

How do we know which plugins are secure? If I wanted access to people's browsing info, a plugin would be the way to get it...