Examine source code of Add to Zola Button

{
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_icon": {
      "16": "images/zola-favicon-16.png",
      "48": "images/zola-favicon-48.png",
      "128": "images/zola-favicon-128.png"
    },
    "default_title": "Add to Zola"
  },
  "name": "Add to Zola Button",
  "short_name": "Add to Zola",
  "description": "Add anything from any store to your Zola registry",
  "homepage_url": "https://www.zola.com/",
  "icons": {
    "16": "images/zola-favicon-16.png",
    "48": "images/zola-favicon-48.png",
    "128": "images/zola-favicon-128.png"
  },
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "https://*/*",
    "http://*/*"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "{ec715b89-02d6-49e9-81c2-27dd6807fd6e}",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ]
      }
    }
  },
  "author": "Zola",
  "version": "3.1.5"
}