关灯 is a Chrome add-on that allows users to easily switch between dark and light themes on webpages. With a small file size of just 3KB, this add-on is lightweight and efficient. It does not require any dependencies and is implemented using native CSS.

One of the key features of 关灯 is its focus on security. It only requests permission to read information from the active tab and uses this information to inject the appropriate styles. It does not require any additional permissions or access any other information, making it a safe choice for users.

This add-on is an open-source project and is available for free. Users can always check the latest source code for updates and improvements. The developer, slc3a2, created this tool with the intention of addressing their own needs as they suffer from dry eyes and often browse webpages at night. They are committed to promptly fixing any issues that arise, as long as their workload permits.