Env Border is a Chrome extension that aids web developers by visually differentiating between various application environments. By setting up specific domains for local, Quality Engineering (QE), and production environments, users can easily identify their current working context through a colored border around the webpage. This feature significantly enhances workflow efficiency by providing immediate visual cues.

The extension automatically recognizes the environment based on the domain and applies color-coded borders: green for local, yellow for QE, and red for production. Additionally, users have the flexibility to customize domain inputs for each environment. This functionality ensures that developers can maintain clarity and focus while navigating through multiple environments during the development process.