O'ReillyNet presents
an excerpt from Firefox Hacks. "So far, our example has
concerned adding a menu item to the Firefox Tools menu, but there are other
areas of the Firefox UI into which you can overlay. It's possible to
overlay into any area of the visible UI, once you know the id of the widget
to which you want to add. For example, the Download Manager Tweak extension
(http://dmextension.mozdev.org) adds a button to the Downloads panel in
Firefox's Options window."
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