This extension allows translate selected text, and add translated words to a vocabularyFor translation you can select a text, right click on it and choose "Add word" in the menu, or you can just double-click on a word, in both of the cases the dialog with translations and definitions of the selected text will appear, and the selected text will be added to your vocabulary. The extension will help you to improve your vocabulary by having quizes with words you added, it will automatically notify you if it is a time to repeat some of the words from your vocabulary.