Examine source code of SoundCloud Player

{
  "manifest_version": 2,
  "minimum_chrome_version": "32.0.0.0",
  "name": "SoundCloud Player",
  "description": "SoundCloud Player",
  "version": "2.0.5resigned1",
  "icons": {
    "16": "extension/icons/16.png",
    "19": "extension/icons/19.png",
    "24": "extension/icons/24.png",
    "32": "extension/icons/32.png",
    "38": "extension/icons/38.png",
    "48": "extension/icons/48.png",
    "64": "extension/icons/64.png",
    "96": "extension/icons/96.png",
    "128": "extension/icons/128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "extension/icons/16.png",
      "19": "extension/icons/19.png",
      "24": "extension/icons/24.png",
      "32": "extension/icons/32.png",
      "38": "extension/icons/38.png",
      "48": "extension/icons/48.png",
      "64": "extension/icons/64.png",
      "96": "extension/icons/96.png",
      "128": "extension/icons/128.png"
    },
    "default_title": "SoundCloud Player",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "redirect.html"
  },
  "commands": {
    "toggle": {
      "suggested_key": {
        "default": "MediaPlayPause"
      },
      "description": "Play/Pause",
      "global": true
    },
    "next": {
      "suggested_key": {
        "default": "MediaNextTrack"
      },
      "description": "Next track",
      "global": true
    },
    "back": {
      "suggested_key": {
        "default": "MediaPrevTrack"
      },
      "description": "Previous track",
      "global": true
    },
    "replay": {
      "suggested_key": {
        "default": "MediaStop"
      },
      "description": "Stop",
      "global": true
    }
  },
  "background": {
    "page": "background.html"
  },
  "content_scripts": [
    {
      "matches": [
        "http://soundcloud.com/*",
        "https://soundcloud.com/*",
        "http://*.soundcloud.com/*",
        "https://*.soundcloud.com/*"
      ],
      "js": [
        "extension/app/js/content.js"
      ]
    }
  ],
  "permissions": [
    "notifications",
    "tabs",
    "storage",
    "http://soundcloud.com/*",
    "https://soundcloud.com/*",
    "http://*.soundcloud.com/*",
    "https://*.soundcloud.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{33baf8ab-ddc7-434a-ae4e-7a622df1dc61}"
    }
  }
}