Examine source code of Auto Refresh Tab

{
  "manifest_version": 3,
  "name": "Auto Refresh Tab",
  "version": "1.3.3",
  "description": "Automatically refresh the current tab at a set interval",
  "homepage_url": "https://github.com/sejarparvez/auto-refresh",
  "author": "Sejar Parvez",
  "permissions": [
    "tabs",
    "alarms",
    "storage"
  ],
  "commands": {
    "toggle-refresh": {
      "suggested_key": {
        "default": "Alt+R"
      },
      "description": "Toggle auto-refresh for current tab"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "auto-refresh@sejarparvez",
      "strict_min_version": "140.0"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "100": "icons/icon-100.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Auto Refresh",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "100": "icons/icon-100.png"
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; font-src 'self'"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}