Examine source code of EDHREC Importer

{
  "manifest_version": 3,
  "name": "EDHREC Importer",
  "version": "1.0.1",
  "description": "Automatically builds your copied list of MTG cards into EDHREC.",
  "icons": {
    "48": "icons/edhrec-import_48.png"
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "edhrec-importer@hollymphillips.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_icon": "icons/edhrec-import_48.png",
    "theme_icons": [
      {
        "light": "icons/edhrec-import_48.png",
        "dark": "icons/edhrec-import_48.png",
        "size": 48
      }
    ],
    "default_title": "EDHREC Importer",
    "default_popup": "popup/paste_cards.html"
  }
}