Examine source code of Metalocalypse Dark Red

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Metalocalypse Dark Red",
  "manifest_version": 2,
  "description": "I do not own the artwork. I only modified it to work in a theme. All credit goes to original creator of the wallpaper. I did do a lot of work to make this theme though, so I hope you enjoy it!\n(works best with bookmark bar shown, also has a nice addonbar image)"
}