"Concerned about your privacy? Don't worry, just pipe this code right to your shell" :\ Setting the flag in about:config is simple enough, I don't understand

"Concerned about your privacy? Don't worry, just pipe this code right to your shell" :\ Setting the flag in about:config is simple enough, I don't understand why anyone would do anything else. Who's seeing this page who is also unable to make an about:config change?