Examine source code of Show Page Meta Info

{
  "manifest_version": 2,
  "name": "Show Page Meta Info",
  "version": "1.0",
  "description": "Displays page title and meta description/keywords.",
  "browser_action": {
    "default_title": "Show Page Meta Info",
    "default_icon": {
      "64": "icon64.png",
      "128": "icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bbd05162-3f61-498a-85ac-7ccb6f4958f9}",
      "strict_min_version": "103.0"
    }
  }
}