Examine source code of mac pro

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Mac Pro",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(190, 190, 190)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(100, 100, 100)",
      "tab_background_text": "rgb(255, 239, 89)",
      "toolbar_field": "rgb(255, 239, 89)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(127, 218, 239)",
      "popup": "rgb(190, 190, 190)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_selected": "rgb(127, 218, 239)",
      "tab_loading": "rgb(127, 218, 239)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4b061232-b7cf-480f-9955-d567a90d2890}"
    }
  }
}