Examine source code of cool mustang

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "cool mustang",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(73, 147, 166, 0)",
      "toolbar_text": "rgb(134, 170, 196)",
      "frame": "rgb(21, 26, 28)",
      "tab_background_text": "rgb(134, 169, 193)",
      "toolbar_field": "rgb(54, 66, 73)",
      "toolbar_field_text": "rgb(134, 170, 196)",
      "tab_line": "rgb(197, 4, 8)",
      "popup": "rgb(54, 66, 73)",
      "popup_text": "rgb(134, 170, 196)",
      "ntp_background": "rgb(84, 107, 122)",
      "tab_selected": "rgb(59, 77, 88)",
      "tab_loading": "rgb(197, 4, 8)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fb5d7db0-1c3d-4d08-9a0f-0677e9172129}"
    }
  }
}