Examine source code of Opera 58 Light

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Opera",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(247, 249, 250)",
      "toolbar_text": "rgb(88, 90, 91)",
      "frame": "rgb(221, 226, 233)",
      "tab_background_text": "rgb(92, 92, 92)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(247, 249, 250)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(247, 249, 250)"
    }
  }
}