One common feature of browser extensions is the ability to add an icon next to the URL in the browser's address bar ( ). These extensions are designed to add specific features or functionality to the browser, such as ad blocking, password management or, in this case, userscript injection. A browser extension is a small software program that extends the functionality of a web browser. If you want to uninstall Tampermonkey then please check this video:Ī101 Tampermonkey is a browser extension. In order to install Tampermonkey take a look at this video: General Q100: How do I install and uninstall Tampermonkey?