Examine source code of Site Searcher

{
  "name": "Site Searcher",
  "version": "5.3",
  "options_ui": {
    "page": "options.html"
  },
  "icons": {
    "128": "icon_128.png"
  },
  "background": {
    "scripts": [
      "storage.js",
      "punycode.js",
      "search.js",
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "browser_action": {
    "default_title": "Search this site",
    "default_icon": {
      "128": "icon_128.png"
    }
  },
  "commands": {
    "_execute_browser_action": {}
  },
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "site-search@erlendorf",
      "strict_min_version": "57.0"
    }
  }
}