Examine source code of WPFlat ver.2

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "WPFlat ver.2",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-011-d53e0d0d1538ed554a90e056a2f04eca.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(62, 62, 62)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(221, 254, 219)",
      "toolbar_field_text": "rgb(17, 116, 174)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgb(138, 198, 132)",
      "tab_loading": "rgb(0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{929217aa-fc7c-4d0b-9722-9cd7b1d71eb5}"
    }
  }
}