New words are highlighted based on your vocabulary level, which you can learn and retrieve while surfing the web. * Compare the article's words to your vocabulary level and instantly see what percentage of them is familiar to you * Keep track of learned, known, and forgotten words to practice retrieval * Adjust the number of repetitions and size of intervals to fit your learning habits Learn more about the features in the options of the extension and on our website. The extension is in the beta stage, so expect roughness on the edges. We are working on its improvement and would love to hear your feedback.