Examine source code of Green Spring Pattern

{
  "theme": {
    "images": {
      "theme_frame": "firefoxpersona.png"
    },
    "colors": {
      "frame": "#8ef587",
      "tab_background_text": "#017821"
    }
  },
  "version": "2.0",
  "name": "Green Spring Pattern",
  "manifest_version": 2,
  "description": "pattern"
}