Dummy Form Filler is a simple yet effective browser extension designed for Firefox users, specifically aimed at web developers and testers. This tool automates the process of populating HTML forms with dummy data, making it easier for users to test various form functionalities without manual entry. The extension operates out of the box and can be activated using the shortcut Alt+Shift+D, allowing for a quick and efficient workflow.

The extension supports a variety of input elements, including text, email, number, radio buttons, checkboxes, telephone, password, date, URL, and text areas. It intelligently recognizes basic semantic hints, such as labels containing keywords like 'age' or 'phone', to populate fields appropriately. Users can also configure basic options and reset forms to their original values. However, it's important to note that pre-filled data will not be cleared, which may not suit every user's needs.