RunJsOnPageStart is a free Chrome extension developed by taras.d. It falls under the category of Browsers, specifically Add-ons & Tools. As the name suggests, this extension allows users to run JavaScript code before any other scripts on a webpage.

With RunJsOnPageStart, users can easily execute their own JavaScript code before the page starts loading. This can be useful for various purposes, such as modifying the behavior of existing scripts, injecting custom functionality, or performing any necessary actions before the page fully loads.

The extension is straightforward to use. Simply install it from the Chrome Web Store, and then access its options from the browser's toolbar. From there, users can input their desired JavaScript code and save the changes. The code will then be executed before any other scripts on the page are loaded.

Overall, RunJsOnPageStart provides a convenient solution for those who need to run JavaScript code before a webpage fully loads. Its simplicity and effectiveness make it a valuable tool for developers and users looking to customize their browsing experience.