The You should install the extension! PopUp is a new technique that program purveyors are using to push unwanted extensions on visitors. This technique is for sites to display a message stating that "to continue the work of your browser you should install the extension!". It then prompts you to install a Google Chrome extension. If you encounter this message, you should definitely not install these extensions as they modify the browsers configuration to perform undesirable actions.
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Article Link: https://www.bleepingcomputer.com/virus-removal/remove-you-should-install-the-extension-popup