Examine source code of Alliance_Firefox

{
  "theme": {
    "images": {
      "theme_frame": "Alliance_Firefox_Header.jpg"
    },
    "colors": {
      "frame": "#fffb00",
      "tab_background_text": "#111ed9"
    }
  },
  "version": "2.0",
  "name": "Alliance_Firefox",
  "manifest_version": 2,
  "description": "For all the Alliance lovers."
}