Unlike many people, my usage of Firefox 3 has been restricted to test and virtual machines. Thus, I may have stumbled across a bug that goes unnoticed on more actively used systems. There seems to be a problem installing the Flash and Java plugins, at least on Windows machines.
Firefox 3 obviously works fine with both Flash and Java, assuming they are already installed. But, if you try to view a web page that requires either plugin, clicking the "Install Missing Plugins" button (shown below) doesn't work, at least on four Windows machines that I tested.
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