Examine source code of 自动刷新网页

{
  "manifest_version": 2,
  "name": "自动刷新网页",
  "version": "1.2.1",
  "description": "不配置无任何动作，需自行配置匹配的url、检测行为、刷新时间。通过url匹配生效的网页，根据定义的时间启动一个定时器，时间到达自动刷新。检测行为：检测到该行为定时器会从新计时。",
  "browser_action": {
    "default_popup": "popup/options.html",
    "default_icon": {
      "128": "icons/cat.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "128": "icons/cat.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "app.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6e163745-bf41-4fa5-b11e-fb0129ef4a53}"
    }
  }
}