Why is window.Close() not working in Firefox?

Why javascript: window.Close() is not working in Firefox, Is there any solution?

What are the parameters in window.Close()?

In firefox you can't close a window that is not opened by javascript(pop-up). window.close() will not work.

Probably because it is window.close() - with a lower-case c. JavaScript is a case-sensitive language, close and Close are not the same thing.