Examine source code of Gruen_01

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Gruen_01",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(8, 78, 41)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(3, 53, 24)",
      "tab_background_text": "rgb(183, 183, 183)",
      "toolbar_field": "rgb(214, 248, 230)",
      "toolbar_field_text": "rgb(3, 53, 24)",
      "tab_line": "rgb(160, 212, 183)",
      "popup": "rgb(5, 32, 17)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_hover": "rgb(160, 212, 183)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgb(5, 9, 8)",
      "popup_border": "rgb(160, 212, 183)",
      "popup_highlight": "rgb(75, 134, 104)",
      "toolbar_bottom_separator": "rgb(75, 134, 104)",
      "tab_loading": "rgb(160, 212, 183)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d22eddfa-3666-4b26-b771-6798abe7f4db}"
    }
  }
}