Examine source code of The Generic Firefox Theme

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "The Generic Firefox Theme",
  "manifest_version": 2,
  "description": "This is a 100% Free Generic Firefox Browser Theme. It is the Basic of Basic Themes and has a shelf life that will last until the end of time. This Theme Was Made By Recycled Themes. ;.)"
}