Examine source code of Warm yellow field

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Yellow Flower Field ",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 215, 43, 0.62)",
      "toolbar_text": "rgb(81, 73, 0)",
      "frame": "rgb(208, 191, 18)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(56, 51, 0)",
      "tab_line": "rgb(255, 244, 63)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(56, 51, 0)",
      "tab_loading": "rgb(255, 244, 63)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{be0d60cb-874a-4016-bf98-99e11d2f70e1}"
    }
  }
}