Zhongwen is a Firefox extension designed to enhance the Chinese language learning experience. It allows users to translate Chinese characters effortlessly by hovering over them, providing translations in both simplified and traditional forms. The extension includes features such as Hanyu Pinyin display, customizable color coding for tone recognition, and the ability to add words to a built-in list for further study. Additionally, it offers quick access to grammar notes through the Chinese Grammar Wiki and supports keyboard navigation for seamless reading.

Users can easily activate or deactivate the extension with a single click and utilize keyboard shortcuts for various functions, such as exporting words to Anki or Skritter. Zhongwen integrates a recent version of the CC-CEDICT dictionary, ensuring accurate translations, while also allowing for online dictionary lookups. With its user-friendly interface and robust features, Zhongwen is a valuable tool for anyone looking to improve their Chinese language skills.