webext-lightbeam

visualize sites that may be tracking you around the internet
  https://addons.mozilla.org/en-US/firefox/addon/lightbeam-3-0
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Lightbeam is an add-on that allows you to see the third parties that are collecting information about your browsing activity, with and without your consent. Using interactive visualizations, Lightbeam shows you the relationships between these third parties and the sites you visit. This extension is created by Mozilla Foundation.