When I download a theme or other extension file to my desktop and try installing it, it tells me this: The jar file "foxscape-3.04-fx.jar" couldn't be launched. Check the Console for possible error messages. What's the issue?

Regardeless of the file name, I get the same message:
The jar file "NAME OF FILE-fx.jar" couldn't be launched. Check the Console for possible error messages

Although possibly not related to your problem, I have to remind you that the version of Firefox you are using at the moment has been discontinued and is no longer supported. On top of this, it has known unpatched bugs and security problems. I urge you to update to the latest version of Firefox, for maximum security, stability, performance and usability. You can get it for free, as always, at [http://www.getfirefox.com getfirefox.com].

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