9 Firefox Extensions to Protect Your Privacy

RefControl offers you fine-grained control over referrer headers, to prevent sites from knowing where you came from. BetterPrivacy protects you from data stored in Local Shared Objects, a sort of next-generation cookie.

You'll need to find your own balance in this area - the more extreme
steps you take to protect your privacy, the more inconvenient you'll
find random web surfing. But even blocking advertising cookies and
switch to Tor when you're going to a site you'd like to keep to
yourself will go a long way to avoid broadcasting information
indiscriminately.

Do you have your own favorite techniques for protecting your privacy on the web?