Environment Warning is a free Chrome extension designed to assist software developers by providing visual cues about their current development environment. It achieves this by displaying a banner and changing the favicon color based on configured URLs, allowing developers to quickly identify whether they are working in production, staging, or development environments.

The extension enhances workflow efficiency by minimizing the risk of deploying changes to the wrong environment. Users can easily configure the URLs associated with different environments in the options menu, ensuring that the appropriate warnings are displayed as needed. This tool is particularly beneficial for teams that manage multiple environments concurrently.