Examine source code of Meta Info Viewer

{
  "manifest_version": 2,
  "name": "Meta Info Viewer",
  "version": "1.0",
  "description": "View the page title and its meta description and keywords.",
  "browser_action": {
    "default_title": "Meta Info Viewer",
    "default_icon": {
      "64": "icon64.png",
      "128": "icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e0e2cf0a-9359-464d-b77c-3a1c8aa1a394}",
      "strict_min_version": "110.0"
    }
  }
}