Chrome/Rockmelt: It always seems like a simple, if brutal, call: either keep your cookies, or lose access to a working Gmail, Facebook and other neat services. Enter Disconnect, an extension that de-personalises your browsing without cutting off necessary functionality.
Install Disconnect in Chrome or Rockmelt, and you'll notice it starts building up a tally in its taskbar icon. Click the button, and you can see how many requests—where you came from, where you're going, what you searched for before, whether your Facebook friends like this page, etc &mdash Disconnect has blocked from Google, Twitter, Facebook and other services. Web apps can still do their basic magic, but they lose sight of you as a person whose decisions they can easily track.
Disconnect is a free download for Chrome and the Rockmelt variation. It's also open source and made by a former Google employee.