firefox - How to make a 50% transparent window? -

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i'm trying semi-transparent window. there's attempt:

<?xml version="1.0"?> <?xml-stylesheet href="chrome://global/skin/" type="text/css"?>  <window width="400" height="300"     style="-moz-appearance: none;             background: rgba(255, 255, 255, 0.5);             filter:alpha(opacity=50);             opacity: 0.5;             -moz-opacity:0.5;"     xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">      <label value="main window"/>  </window>

although text on window transparent, window not.

i've read works panels, not windows, tried both <panel> , <window> none of become transparent.

i've tried approaches used here, here, , here. nothing works.

any idea?

i realized while dragging tab in firefox 3.6.10, shows transparent window. need know how it's done now.

i did bit of poking around , found bug 408284, sadly isn't fixed gecko 2. it's not possible on linux.


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