Source Replacer is a free Chrome add-on developed by kdaimon.8. It falls under the category of Browsers and is specifically categorized as an Add-ons & Tools subcategory.

This add-on is designed to replace the source files for debugging purposes. It allows users to replace any files downloaded in web pages, making it useful for developers who want to test their new JavaScript files in a real environment.

The main use case for Source Replacer is when a developer creates a new JavaScript file and wants to try it out in a live production environment. By inputting the URL of the original file as "Original URL" and the URL of the staging file as "New URL," users can see the staging file run in the production environment.

With Source Replacer, developers can easily debug and test their code without making any changes to the original files. This add-on provides a convenient way to troubleshoot and experiment with different versions of JavaScript files.