Examine source code of Background Remover

{
  "manifest_version": 3,
  "name": "Background Remover",
  "short_name": "BG Remover",
  "description": "Remove image backgrounds directly in your browser.",
  "version": "1.0.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "background-remover@freeimg.tools",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "109.0"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_title": "Background Remover",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "background": {
    "scripts": [
      "assets/background.js"
    ],
    "type": "module"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self'; connect-src 'self' blob:; img-src 'self' data: blob:"
  }
}