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When I download a .jar file it just leads to another download

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So I was trying to download a .jar mod for Minecraft but when I opened the file it just lead to another download of the same file. Help me

So I was trying to download a .jar mod for Minecraft but when I opened the file it just lead to another download of the same file. Help me
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Firefox doesn't know about this .jar file and you may not have a default application set in Windows and thus you can't open this file via Firefox. You will have to launch the application this file is meant for and open the JAR file in this application.