Google Analytics Opt-out Add-on (by Google)

To provide website visitors the ability to prevent their data from being collected and used by Google Analytics, we have developed the Google Analytics opt-out Browser extension for the Google Analytics JavaScript (ga.js, analytics.js, dc.js). If you want to opt-out, download and install the extension for your web browser. In order to function, the opt-out extension must be able to load and execute properly on your browser. Updates to your browser or operating system may affect the functionality of the opt-out extension. More information about managing your extensions for Chrome can be found at https://support.google.com/chrome/answer/187443?hl=en. By installing this extension, you agree to the Chrome Web Store Terms of Service at https://ssl.gstatic.com/chrome/webstore/intl/en/gallery_tos.html and the Google Analytics Opt-out Browser Add-on Terms of Service at https://tools.google.com/dlpage/gaoptout/intl/en/eula_text.html.

Screenshots from Chrome Web Store