Examine source code of Dark Modern Firefox

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#0c2945",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Dark Modern Firefox",
  "manifest_version": 2,
  "description": "The bright, modern Firefox logo stands out against the dark patterned background."
}