Examine source code of simple smart v4

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "simple smart v4",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-036-40a272fe657f748396e017c7a64ee2dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(244, 240, 228)",
      "toolbar_text": "rgb(87, 87, 87)",
      "frame": "rgb(142, 159, 201)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(229, 249, 255)",
      "toolbar_field_text": "rgb(61, 61, 61)",
      "tab_line": "rgb(255, 24, 28)",
      "popup": "rgb(241, 243, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(255, 24, 28)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{910cb22c-101a-4176-9528-0f9f1e77d2ca}"
    }
  }
}