Examine source code of Add to EasyRegistry Button

{
  "manifest_version": 3,
  "name": "Add to EasyRegistry Button",
  "version": "26.7.26",
  "description": "Save gifts from any online store to one free registry — no copy-pasting. For weddings, baby showers, birthdays & every occasion.",
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "tabs",
    "contextMenus"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "icons": {
    "16": "public/icon-16.png",
    "32": "public/icon-32.png",
    "48": "public/icon-48.png",
    "128": "public/icon-128.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "public/*",
        "assets/*",
        "vendor/easyregistry/*",
        "test/*",
        "content/*",
        "content.css"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@easyregistry.com.au",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    }
  },
  "options_ui": {
    "page": "options/index.html"
  },
  "background": {
    "scripts": [
      "background/index.js"
    ]
  },
  "action": {
    "default_icon": {
      "16": "public/icon-16.png",
      "32": "public/icon-32.png",
      "34": "public/icon-34.png"
    }
  }
}