Examine source code of Auto Refresh Page - ADYA BD

{
  "manifest_version": 2,
  "name": "Auto Refresh Page - by ADYA",
  "version": "1.0.0",
  "description": "Automatically refresh any web page at custom or random intervals, with a live countdown, per-site auto-start rules, and a clean modern UI.",
  "author": "ADYA",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "auto-refresh-page-adya@adya.extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "alarms",
    "notifications",
    "webNavigation",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_title": "Auto Refresh Page - by ADYA",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png"
    }
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "commands": {
    "toggle-refresh": {
      "suggested_key": {
        "default": "Alt+Shift+S"
      },
      "description": "Start/Stop auto refresh on this tab"
    },
    "stop-all-refresh": {
      "suggested_key": {
        "default": "Alt+Shift+X"
      },
      "description": "Stop auto refresh on all tabs"
    }
  }
}