Who Wrote That? (WWT) is a browser extension developed by Wikimedia Foundation's Community Tech Team. It is a free and user-friendly tool that enhances the Wikipedia experience by providing authorship and revision information directly on Wikipedia articles. With WWT, users can easily explore the source and background of an edit without having to dig through revision history.

One of the key features of Who Wrote That? is its ability to highlight all content by the same author when you hover over it. This makes it easier to identify the contributions of a specific author and understand their impact on the article. Additionally, when you click on content, the tool displays the author of the revision, along with detailed information about the revision itself. This allows users to gain insights into the editing process and the evolution of the article over time.

Overall, Who Wrote That? is a valuable browser extension for anyone who wants to delve deeper into the authorship and revision information of Wikipedia articles. It provides a seamless and intuitive way to explore the background of edits, making it a useful tool for researchers, students, and curious readers alike.