Examine source code of Greenery

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Greenery",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(145, 181, 77)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(115, 144, 60)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(115, 144, 60)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(145, 181, 77)",
      "popup": "rgb(72, 90, 38)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(145, 181, 77)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{966f5e90-569c-4ab8-a861-cff63d17dd66}"
    }
  }
}