Windows Media Player DLL is busy or not responding.

When I attempt to open a web page with Windows Media Player embedded, Firefox locks up for about 30 seconds, then a message appears that says "Windows Media Player is busy or not responding."
It offers to let me continue waiting, or stop the DLL.
If I continue waiting, the page eventually loads, and Firefox wakes up.
The embedded media player has a gray background and nasty-looking circa 1998 controls. (It used to have contemporary controls, resembling stand-alone media player.)
Embedded media player still works correctly with Internet Explorer, and shows the correct controls and user interface.
I've already set plugins.load_appdir_plugins to true - that wasn't it.
This seems to be a recent issue - earlier versions of Firefox handled the embedded media player fine.
I have npdsplay.dll version 3.0.2.629 and np-mswmp.dll 1.0.0.8 installed.
Thanks.

Hello JacksBack,
Some plugins that are no longer maintained, like the Windows Media plugin, have their files installed in a place that Firefox no longer supports.
Please refer to:
[[Windows Media or other plugins stopped working after Firefox update]]

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