JS URL Injector is a free Chrome add-on developed by Pamela. It falls under the category of Browsers and is specifically classified as an Add-ons & Tools subcategory.

The main purpose of JS URL Injector is to allow users to inject JavaScript code from a custom URL into every web frame. It provides the ability to specify a JavaScript file through a URL, which will then be injected into all websites visited. However, it is important to note that this add-on should only be used by individuals who are familiar with JavaScript and understand the implications of injecting code into web frames.

Overall, JS URL Injector provides a convenient way for users to inject JavaScript code into web frames, but caution should be exercised when using it to avoid unintended consequences.