Published Date is a Firefox extension designed to help users determine the publication and last updated dates of web pages. Utilizing approximately 40 different methods, it effectively gathers information that may not be readily available on the page itself. The tool is particularly useful for researchers, writers, and anyone who relies on the accuracy of web content over time.

With its subscription-based model, Published Date offers a streamlined interface that integrates seamlessly with Firefox. Users can explore multiple possible publication dates, providing a comprehensive view of the web page's history. This functionality not only enhances the browsing experience but also aids in verifying the reliability of online information.