Fast English is a browser extension designed to facilitate the learning and practice of English vocabulary. It allows users to make the most of their spare moments by practicing words with just a click of the add-on icon. This tool is particularly useful for individuals looking to enhance their language skills in a convenient manner.

Users can categorize vocabulary into virtual boxes labeled Learning, Ignore, and Know, enabling targeted study sessions. The extension also provides customizable settings to select specific categories of words for practice. Additionally, it offers statistical insights into successful and unsuccessful responses. While the basic version includes a limited vocabulary, users can unlock a complete database and future features by activating full access.