Examine source code of Nice Green

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Nice Green",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(27, 79, 48)",
      "toolbar_text": "rgb(168, 211, 207)",
      "frame": "rgb(14, 41, 25)",
      "tab_background_text": "rgb(176, 203, 201)",
      "toolbar_field": "rgba(0, 0, 0, 0.2)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(27, 79, 48)",
      "popup": "rgb(14, 41, 25)",
      "popup_text": "rgba(255, 255, 255, 0.5)",
      "ntp_background": "rgb(6, 19, 12)",
      "sidebar": "rgb(14, 41, 25)",
      "tab_loading": "rgb(27, 79, 48)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d28187bc-0946-4182-9b3c-8577a2a6af51}"
    }
  }
}