Examine source code of Shorto - URL Shorter

{
  "name": "Shorto - URL Shorter",
  "version": "0.3",
  "description": "Create a small URL",
  "icons": {
    "16": "logo.png",
    "48": "logo.png",
    "128": "logo.png"
  },
  "action": {
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "manifest_version": 2,
  "permissions": [
    "storage",
    "activeTab"
  ],
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "windows": "Ctrl+Shift+S",
        "mac": "Command+Shift+S"
      }
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{53cb6993-1e31-4329-a60a-efcd736f3bc6}"
    }
  }
}