Examine source code of Auto refresh page

{
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "version": "1.0.32",
  "minimum_chrome_version": "100",
  "background": {
    "page": "html/background.html",
    "persistent": true
  },
  "permissions": [
    "tabs",
    "storage",
    "notifications",
    "cookies",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "images/icon128.png",
    "default_popup": "html/popup.html"
  },
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/jquery.js",
        "js/jquery.simple.timer.js",
        "js/script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9cf28bf3-b2e3-4912-b703-ad49a17b97c8}"
    }
  }
}