uBO-Scope is a Firefox extension designed to enhance online privacy by revealing connections to remote servers during web browsing. Its primary function is to display the number of distinct third-party servers that a webpage attempts to connect to, indicated by a badge count on the toolbar icon. A lower count is preferable, suggesting fewer unwanted connections, while a higher number may indicate potential privacy concerns. The extension is free to use and falls under the Security & Privacy category, specifically targeting Anti-Spam & Anti-Spy functionalities.

This tool utilizes webRequest listeners to track network requests made by webpages, providing real-time reporting on the outcomes of these requests. It works seamlessly with various content blockers, including those using DNS servers, as long as the browser supports the webRequest API. However, it is important to note that it cannot report network requests made outside the scope of this API, limiting its functionality in certain scenarios.