Disconnect
Stop major third parties and search engines from tracking the webpages you go to and searches you do.
https://chrome.google.com/extensions/detail/jeoacafpbcihiomhlakheieifhpjdfeo?hl=ja

ChromeBlock
Stop secret tracking of your web browsing
https://chrome.google.com/extensions/detail/epanfjkfahimkgomnigadpkobaefekcd?hl=ja