Notefox is a subscription-based Firefox add-on designed to enhance web browsing by allowing users to take notes directly on websites. Users can create notes for entire domains or specific pages, ensuring that important information is easily accessible. The add-on features an organized notes management page where notes can be exported, imported, or cleared, and users can also set tags and perform searches for efficient retrieval.

Customization is a key feature of Notefox, with options available to personalize the add-on according to user preferences. It supports auto-saving of notes, displays them as sticky notes, and includes customizable keyboard shortcuts for quick access. Additionally, users have the option to sync their data through a Notefox account, ensuring their notes are available across devices.