Installing/Using .jar file

[Doomfury]

There is a Firefox theme I want to use but I only have the .jar file for it. How do I install/use that? Thanks

[Mr.HotStuff]

I would try opening firefox and under the FILE heading look for open file - it may work from there - just pick out what it is you want

I used it for adding image grabber but that was an xpi file

try and see what happens

[Hard Drive]

You can use WinRAR to open .jar files

Just make sure you go to WinRAR and select .jar association for it. To do this:
Open WinRAR => Options => Settings => Integration => Check JAR Association