Can I update my old Firefox theme manually?

I miss my old Orbit Grey theme which worked on Firefox 0.9.4, but won't work in 1.0. I don't think it'll ever be udpated, as the creator's website is gone. Is there any way for me to update the file myself. I know it's a JAR file that can be edited in Notepad. What changes would I need to make to force it to work with 1.0?

I'm not a programmer here, so I have no idea where to begin. There's nothing on doing such a thing in Google. Thanks.

 

Forget it! You have to know what you are doing, and, even then you get some clunker.

 

*sighs and hangs head.* I thought as much.