Session Sync is a Firefox add-on designed for managing browsing sessions effectively. It allows users to save sessions as bookmarks, providing easy access across devices. The add-on features an intuitive user interface for creating, restoring, and editing sessions or bookmarks, making it a handy tool for users who frequently switch between devices or need to organize their browsing activities. Moreover, it integrates seamlessly with Firefox's Bookmark Manager, enabling users to back up and restore their saved sessions effortlessly.

Key functionalities include advanced session management with options for lazy-loading, active tab organization, and a rich array of shortcut keys for quick access to various views. Session Sync supports synchronization with any bookmark service, particularly the recommended Firefox Sync Account. The add-on prioritizes user customization with several viewing modes and an advanced drag-and-drop interface, ensuring a personalized browsing experience.