Examine source code of Quiet time

{
  "theme": {
    "images": {
      "theme_frame": "quiettime.jpg"
    },
    "colors": {
      "frame": "#0ce5f5",
      "tab_background_text": "#1c4a05"
    }
  },
  "version": "2.0",
  "name": "Quiet time",
  "manifest_version": 2
}