Danger Banner is a free Chrome extension developed by Ying Zhou. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This extension is designed to help developers avoid operating on the wrong environments.

The main feature of Danger Banner is its ability to show a red banner on specific pages. This serves as a visual reminder for developers to be cautious and avoid making changes on these pages. By displaying a prominent warning, Danger Banner helps prevent accidental modifications or actions that could have serious consequences.

One of the key advantages of Danger Banner is its support for regular expressions (regex). This allows for advanced matching, enabling developers to specify complex patterns for page URLs. With this feature, developers can easily customize the behavior of the extension and ensure that the red banner is displayed on the desired pages.

Overall, Danger Banner is a useful Chrome extension for developers who want to avoid operating on the wrong environments. Its simple yet effective approach of showing a red banner on specific pages, along with support for regex, makes it a valuable tool in preventing accidental actions and ensuring a safer development process.