Examine source code of Open Graph Checker

{
  "manifest_version": 3,
  "name": "Open Graph Checker",
  "version": "0.4.0",
  "description": "Preview and check a page's Open Graph metadata — see how it will look when shared and which tags are missing.",
  "action": {
    "default_title": "Open Graph Checker",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon-16.png",
      "32": "icon-32.png",
      "48": "icon-48.png",
      "128": "icon-128.png"
    }
  },
  "icons": {
    "16": "icon-16.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "open-graph-checker@coywolf.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}