Examine source code of Cold rain

{
  "theme": {
    "images": {
      "theme_frame": "rain_c.jpg"
    },
    "colors": {
      "frame": "#feffbf",
      "tab_background_text": "#feffbf"
    }
  },
  "version": "2.0",
  "name": "Cold rain",
  "manifest_version": 2
}