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Jar save file

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So i have been having this issue where whenever i download a jar file it saves it as a Firefox file. After it saves it as a Firefox file i can no longer use it if i open it it just puts the file location in my web browser. Can anyone help me figure out how to change jar files from saving as a Firefox file and make them save as just a normal .Jar file

So i have been having this issue where whenever i download a jar file it saves it as a Firefox file. After it saves it as a Firefox file i can no longer use it if i open it it just puts the file location in my web browser. Can anyone help me figure out how to change jar files from saving as a Firefox file and make them save as just a normal .Jar file

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Does it help if you set Firefox to always ask you where to save downloads? That allows editing the file name before saving. This is on the Options/Preferences page:

Does it help if you set Windows to always show all file extensions? Tips on that here if needed:

https://www.bleepingcomputer.com/tutorials/how-to-show-file-extensions-in-windows/