5 ਤਾਰਿਆਂ ਵਿੱਚ 4 ਮਿਲੇ

I was looking for exactly this feature!

My only comment would be: why not switch the functionality of both buttons? So that the top button closes the entire window and the smaller button below it closes the tab? I would like it even better in that way...

Anyway, good job!

ਇਹ ਸਮੀਖਿਆ ਐਡ-ਆਨ (1.1) ਦੇ ਪਿਛਲੇ ਵਰਜਨ ਲਈ ਹੈ। 

Close Button should allow you to get the behavior you want.