Window.close working sometimes and sometimes not
<p>According to <a href="https://developer.mozilla.org/en-US/docs/DOM/window.close?redirectlocale=en-US&amp;redirectslug=window.close" rel="nofollow">Mozilla</a>,
window.close() won't work in FF if window is not opened with window.open();</p>

<p>We have implemented ExtJS in a project and a new window/tab is opened with anchor tag and target='_blank'. In new window, there is close button with js code: 'window.close();'.</p>

<p>As per mozilla standard, this code should not work at all but strangely it works in some cases and doesn't work in some cases.</p>

<p>Can anyone provide some hint/suggestion or workaround please?</p>
