AO3 Enhancements is a subscription-based add-on for Firefox that significantly improves the user experience on the Archive Of Our Own (AO3) website. This tool introduces several configurable tweaks, such as enhanced work statistics that display reading time, finish reading estimates, and a Kudos/Hits ratio. Users can also access detailed chapter stats, including published dates and reading metrics, making it easier to discover high-quality fanfiction.

In addition to these features, AO3 Enhancements allows users to filter search results based on various criteria, including language, author pseudonyms, and tags. The add-on also offers multiple style customizations, such as adjusting text width for better readability on larger displays. All features are designed to be user-friendly and accessible, with most options disabled by default for a streamlined experience.