Examine source code of Session Keeper

{
  "manifest_version": 3,
  "name": "Session Keeper",
  "version": "1.1.0",
  "description": "Keeps a browser session active by reloading a tab or clicking an element at a set interval.",
  "permissions": [
    "tabs",
    "storage",
    "alarms",
    "notifications",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_icon": {
      "48": "icons/icon-inactive-48.png"
    },
    "default_title": "Session Keeper (Inactive)",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "48": "icons/icon-active-48.png",
    "96": "icons/icon-active-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "sessionkeeper@hans-l.de"
    }
  }
}