Examine source code of Cool

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Cool",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-003-31b6bea3c78e3a19fd889b0389652a94.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(71, 172, 233)",
      "toolbar_text": "rgb(112, 248, 239)",
      "frame": "rgb(60, 110, 142)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(0, 167, 255)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(154, 0, 255)",
      "popup": "rgb(72, 169, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(154, 0, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{596aafbb-4dc1-4d28-b11c-8a1577b57578}"
    }
  }
}