Bug in Google Chrome

We have worked in many browser. To my knowledge, Google chrome was the best one that i have ever seen. Its so fast, very good animation, transparency... But there is a major bug in that.

• In Google chrome, if you open multiple tabs, if the user accidentally closed the window, it closes all the tabs without any prior warnings, it closes all the tabs
• Through this post, i request the  developers team of Google chrome to fix this bug, by throwing the warning message if more than one tabs are opened and if the user is trying to close the window.