The Yupoo Yuan Converter extension is a tool that helps users to automatically convert the prices of items listed on the Yupoo website from Chinese yuan to a desired currency. 

The extension is specifically designed for those who use the Yupoo website for buying clothes and shoes, as it can be tedious to manually convert the prices into a desired currency. With this extension, users can easily select the desired currency and the prices will be automatically converted, making shopping on Yupoo more convenient and accessible.