Color Page Border is a free Chrome add-on designed to enhance web development by injecting a colored border around pages based on specific URL substrings. This tool is particularly useful for developers who need to differentiate between various environments such as development, staging, and production. By visually marking these environments, it helps prevent mistakes that could arise from working in the wrong context.

With its simple functionality, users can easily configure which substrings trigger the border color changes, making it a straightforward yet effective tool for web development. The add-on operates seamlessly within the Chrome browser, ensuring that developers can maintain focus on their work without unnecessary distractions.