Page Hacker is a free Firefox extension designed for web development and IT professionals who need to manipulate web page content quickly. By simply pressing the Page Hacker button or using the shortcut Ctrl+F2, users can enter an editing mode that allows them to modify the text on the currently viewed page as if they were using a text editor. A floating toolbar provides various formatting options, enhancing the editing experience.

This tool is particularly useful for removing unwanted elements from a web page prior to printing, creating temporary alterations for pranks, or utilizing Firefox as a basic text editor in a blank tab. It is important to note that any changes made are only visible to the user and are not saved permanently, distinguishing it from more advanced tools like Greasemonkey.