Examine source code of Green Leaves Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Leaves Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(30, 51, 63)",
      "toolbar_text": "rgb(112, 237, 248)",
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(209, 237, 231)",
      "toolbar_field": "rgb(209, 237, 231)",
      "toolbar_field_text": "rgb(2, 41, 124)",
      "tab_line": "rgb(112, 244, 248)",
      "popup": "rgb(209, 237, 231)",
      "popup_text": "rgb(2, 41, 124)",
      "tab_loading": "rgb(112, 244, 248)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3655cd31-cdb4-48cf-99c0-9d87938e0ed0}"
    }
  }
}