Examine source code of Green-sakura v2

{
  "theme": {
    "images": {
      "theme_frame": "firefoxbar_ver4.png"
    },
    "colors": {
      "frame": "#329999",
      "tab_background_text": "#c7e3e3"
    }
  },
  "version": "2.0",
  "name": "Green-sakura v2",
  "manifest_version": 2,
  "description": "This is the same for firefox 4."
}