Tab Cleanup is a malicious extension promoted by means of the tabcleanup.com pop-up ads. It targets Google Chrome, Mozilla Firefox and other popular browsers. The mission of tabcleanup.com is to force you into installing the Tab Cleanup extension that will change a lot of browser settings. Plus, because of the extension enabled, the default search engine settings may be changed without the user’s permission. We recommend you to carefully follow this guide that explains how to get rid of it effectively.