Examine source code of Dark green nature

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "green leaf",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-017-7074520d97b5c592d413aed5f115f093.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(27, 40, 32)",
      "toolbar_text": "rgb(154, 212, 161)",
      "frame": "rgb(21, 28, 23)",
      "tab_background_text": "rgb(95, 139, 101)",
      "toolbar_field": "rgb(32, 47, 34)",
      "toolbar_field_text": "rgb(191, 255, 199)",
      "tab_line": "rgb(65, 96, 68)",
      "popup": "rgb(27, 40, 32)",
      "popup_text": "rgb(218, 228, 220)",
      "tab_loading": "rgb(65, 96, 68)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a6cd76fd-33fb-4e03-a6f7-d73861d76447}"
    }
  }
}