Examine source code of FireFox Theme by Wrath

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#5388f2",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "FireFox Theme by Wrath",
  "manifest_version": 2,
  "description": "Hello,\nThis is my first theme for Mozzila Firefox (WB)\nI mean you like this and you choice great side of this theme\n\n~Created with pasion and by Piotr Kuzmiuk"
}