Examine source code of Wallpaper Blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Cool Blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-018-0ca3dfc7bb661ec53999d358812ce0ab.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(40, 48, 60, 0.49)",
      "toolbar_text": "rgb(236, 250, 252)",
      "frame": "rgb(96, 138, 177)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(175, 180, 181)",
      "toolbar_field_text": "rgb(216, 226, 234)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgba(108, 132, 164, 0.81)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(238, 231, 214)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1181f5e4-0a21-4091-89cf-36a327c46d88}"
    }
  }
}