Merriam-Webster's Learners Dictionary is a powerful subscription-based add-on for Firefox, designed to enhance the online dictionary experience. It allows users to quickly look up words by double-clicking or highlighting them and offers audio pronunciations, making it a valuable tool for learners of the English language. Users can easily bookmark entries for future reference, organizing them within the browser's bookmarks section.

A new feature allows users to disable the automatic launch of the dictionary when double-clicking, providing a more customizable experience. The add-on also includes a convenient option to visit the full entry on learnersdictionary.com in a new tab by clicking the Merriam-Webster logo. This functionality, combined with its user-friendly interface, makes it an essential resource for students and language enthusiasts alike.