Examine source code of Random User-Agent

{
  "manifest_version": 2,
  "name": "Digital Reader",
  "version": "1.0.9",
  "description": "为火狐用户提供阅读帮助.",
  "developer": {
    "name": "timor"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "alarms",
    "contextMenus",
    "contextualIdentities",
    "cookies",
    "identity",
    "idle",
    "menus",
    "storage",
    "theme",
    "webRequest",
    "webRequestBlocking",
    "bookmarks",
    "browserSettings",
    "browsingData",
    "downloads",
    "downloads.open",
    "find",
    "geolocation",
    "history",
    "management",
    "nativeMessaging",
    "notifications",
    "pkcs11",
    "privacy",
    "sessions",
    "tabs",
    "topSites",
    "webNavigation",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0157a673-c843-4b4e-8071-d3df6230db4a}"
    }
  }
}