Examine source code of simple smart v3

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "simple smart v3",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-036-40a272fe657f748396e017c7a64ee2dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(186, 177, 186)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(87, 76, 132)",
      "tab_background_text": "rgb(234, 234, 234)",
      "toolbar_field": "rgb(227, 240, 253)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(255, 131, 0)",
      "popup": "rgb(243, 243, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(255, 131, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b6ac586d-ca85-417b-b0f0-1e59d8a60ec8}"
    }
  }
}