Who Wrote That? (WWT) is a Firefox browser extension designed to enhance the way users interact with Wikipedia. This tool provides valuable authorship information directly on articles, allowing users to see which content is written by the same author simply by hovering over it. This feature is particularly useful for readers who want to evaluate the credibility of information based on its source.

Additionally, WWT enables users to click on specific content to reveal the author's identity and details regarding their revisions. This functionality streamlines the process of understanding the background of edits, making it easier for users to assess the reliability of the information presented without needing to navigate through the complex revision history of Wikipedia.