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I installed java with plugins and still can't open documents with .jar. Do I have to direct it to C:\Acer\ProgramFiles\ and how do I change?

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I have been trying to open a .jar file on a new Acer laptop. I installed the JAVA, however, when I try to open the .jar files it only brings me back to install Java. The computer is an Acer and the program files are located at C:\Acer\ProgramFiles instead of C:\program files. Do I need to change the web browser somehow to read at C:\Acer\ProgramFiles\?

I have been trying to open a .jar file on a new Acer laptop. I installed the JAVA, however, when I try to open the .jar files it only brings me back to install Java. The computer is an Acer and the program files are located at C:\Acer\ProgramFiles instead of C:\program files. Do I need to change the web browser somehow to read at C:\Acer\ProgramFiles\?

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What kind of .jar file do you try to open and why?

The .jar files that Firefox uses for a theme are not Java files, but are ZIP archives that store the theme files.
You can use "File > Open File" or drag the .jar file in the "Tools > Add-ons > Appearance/Themes" window to install the theme.