Thanks for prompt reply. No, not on popup window. on main page. I actually works if written directly in browser url, but not if called from a script on the page. However works either way from explorer!
What i'm trying to do is place a link on a logout page for closing the browser.
Turns out Mozilla will only use a window.close() script to close a page that was previously opened by a script, such as a popup window! (amazing what one can learn by simply Googling a question!!!)
Anyway if someone knows a work around to this, I would be greatful!