The Universal Automatic Currency Converter is a free Firefox extension designed to streamline currency conversion for users. It supports over 170 currencies and offers intelligent detection of currency symbols, making it easy to convert values on any webpage. The extension operates non-intrusively, ensuring that it does not disrupt website functionality while providing quick access to conversion options. Users can customize how prices are displayed, from symbolic formats to textual descriptions, enhancing usability across different contexts.

In addition to automatic conversions, the extension features a mini converter accessible from the popup window, allowing for quick conversions between currencies. Users can also highlight converted prices and toggle between original and converted values with ease. The ability to blacklist or whitelist specific websites for conversions adds a layer of control for users. Overall, this extension provides a comprehensive solution for anyone needing reliable currency conversion while browsing.