The 1.4 version of User Script for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free software for Mac OS X was originally developed by HanXianzhao. The program is categorized as Developer Tools. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
User Script lets you run your code in any website. After you download the app, you must check the User Script extension in the extension panel of the Safari settings to be able to use the functions of this app normally. Then, you can inject JavaScript code fragments or CSS styles into web pages to customize web page styles and behaviors for a customized browsing experience.
You may want to check out more Mac applications, such as Mighty Mouse Script Menu, Huygens Scripting or Script Timer, which might be similar to User Script.
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