Homestuck Companion is a Firefox extension designed to enrich the Homestuck experience for fans of the webcomic. It provides comprehensive commentary for Homestuck up to the end of Disc 2, along with complete commentary for Problem Sleuth. The extension also allows for seamless keyboard navigation across all adventures, making it easier for users to explore the content without interruptions. Additionally, it connects users to the Unofficial Homestuck Collection, ensuring that all links redirect to the correct collection URLs in real time.

The extension features a user-friendly interface that allows for in-browser commentary viewing on supported URLs, enhancing the storytelling experience. Users can easily toggle the commentary display through options, catering to those who prefer a distraction-free reading environment. Keyboard shortcuts facilitate navigation, with arrow keys for page changes and control options for pesterlogs, although some limitations exist for specific adventures like Bard Quest.