This is designed to be simple webpage that will display a warning when you attempt to close the page. The idea is to leave this tab open in your browser so that your browser will display a warning before you attempt to close a browser window containing multiple tabs. This is a helpful way to prevent accidentally closing all tabs by closing a browser window.
Please contact me if you discover any bugs or have ideas for enhancements.
DISCLAIMER: This project and all of its content and features are provided "AS IS" and "WITH ALL FAULTS" and may not function as intended or desired. Use it at your own risk. If you are technically inclined, you are encouraged to view the source code.