''No one shall be subjected to arbitrary interference with his privacy, family, home or correspondence. Everyone has the right to the protection of the law against such interference.'' - Human Rights Declaration

In less than 10 minutes, you can drastically improve your privacy online and protect yourself against unwanted and invisible tracking.
Note that these privacy safeguards will also be blocking some ads. EFF is working with online advertisers to try to convince them to provide real privacy protections for users, but until they agree to meaningful standards about online tracking, these steps will be necessary for users to safeguard their browsing privacy. Aside from removing ads, these changes won't affect your browsing experience on the vast majority of websites. It's possible, however, that a tiny fraction of websites may behave differently or break, in which case the easiest solution is to temporarily use a "private browsing" mode without the settings enabled, or a fresh browser profile/user with default settings.

Firefox instructions Chrome instructions

Step 1: Install Adblock Plus

Get Adblock Plus. After it is installed, be sure to change your filter preferences to add EasyPrivacy:

Then go to "Add Filter Subscription" -> "Add a different subscription" and select "EasyPrivacy":

Step 2: Change Cookie Settings

Now you are going to set your cookies to expire when you exit your browser, and disallow third-party cookies from being set. To do this, go to Edit -> Preferences -> Privacy. Under "History", choose the drop down "Use custom settings for history". Under "Accept cookies from sites", uncheck "Accept third-party cookies", and right below select "Keep until I close Firefox":

Great! No more unwanted tracking cookies.

Step 3: Turn Off Referers

This famously misspelled header typically sent by default with every HTTP request gives a lot of potentially personal information to websites. But you can turn it off. Open a new tab and in your URL bar, type "about:config". You will see a scary warning; click "I'll be careful, I promise!" At the search bar, type "referer". You should see the value "network.http.sendRefererHeader". Double click it, and change the value to 0:

Ta da! No more referers. Now close that tab if you are worried about accidentally changing other settings.

Step 4: Install HTTPS Everywhere

Install EFF's browser add-on HTTPS Everywhere. This maximizes your use of HTTPS to ensure that your private conversations with websites can't be snooped on or tampered with by other parties.
Congratulations! You are now in an elite group of users fighting back against unwanted privacy invasions. Give yourself a pat on the back, and then please share these tips.

Step 1: Install Adblock Plus

Get Adblock Plus. After it is installed, be sure to change your filter preferences to add EasyPrivacy. To do this, first visit the AdBlock Plus website. Click on the link to "Add EasyPrivacy to Adblock Plus":

This should take you to the Adblock Plus options screen. Simply click add and you're all set:

Step 2: Change Cookie Settings

Now you are going to set your cookies to expire when you exit your browser, and disallow third-party cookies from being set. To do this, locate the Chrome settings menu, which should one of the following two icons in the top right of your browser:

or

From this menu, go to "Settings", and scroll to the bottom and click "Show Advanced Settings." Under "Privacy", click "Content Settings". Select "Keep local data only until I quit my browser / for current session", and check "Block third-party cookies and site data":

Great! No more unwanted tracking cookies.

Step 3: Turn Off Referers

This famously misspelled header typically sent by default with every HTTP request gives a lot of potentially personal information to websites. But you can turn it off. To do so, install the extension Referer Control . After installing, scroll down and locate the text "default referer for all other sites" and click "Block":

Ta da! No more referers.

Step 4: Install HTTPS Everywhere

Install EFF's browser add-on HTTPS Everywhere. This maximizes your use of HTTPS to ensure that your private conversations with websites can't be snooped on or tampered with by other parties.
Congratulations! You are now in an elite group of users fighting back against unwanted privacy invasions. Give yourself a pat on the back, and then please share these tips.

And One More Thing: Install Ghostery