The AO3 Enhancement Suite is a Firefox browser extension designed to enrich the user experience on Archive of Our Own (AO3) by offering a suite of practical features. Key functionalities include autosaving comments per work, ensuring that users do not lose their thoughts during browsing sessions. The extension also introduces a floating comment box, allowing for seamless interaction as users scroll through works, alongside customizable opacity settings for added convenience.

In addition to these features, users can hide works based on specific criteria such as authors, fandoms, and tags, making it easier to navigate through extensive archives. The extension also allows for the insertion of selected text into the comment box with customizable formatting and the ability to save search parameter presets. Further enhancements include the option to collapse excessive tags and view additional work stats like average words per chapter and estimated reading time, all of which can be tailored to individual preferences.