Param Appender is a free Chrome extension developed by Stupid Cat. This handy tool allows users to append a configurable parameter to the URL whenever there is a change in the URL. It is particularly useful for web developers, testers, and anyone who needs to manipulate URLs for various purposes.

With Param Appender, you can easily specify the URLs that you want to affect using a regex configuration. This gives you the flexibility to target specific URLs or patterns and append the desired parameters. Whether you need to add tracking codes, session IDs, or any other parameters, Param Appender makes it simple and efficient.

The extension is lightweight and easy to use. Once installed, it seamlessly integrates into your Chrome browser, providing a hassle-free way to modify URLs on the fly. It is a valuable tool for anyone working with URLs and needing to append parameters for testing, debugging, or other purposes.