Examine source code of Rest Easy

{
  "manifest_version": 3,
  "name": "Rest Easy",
  "version": "1.0.0",
  "description": "Lightweight REST API client. Test HTTP requests directly from your browser.",
  "icons": {
    "48": "branding/icon-48.png",
    "96": "branding/icon-96.png",
    "128": "branding/icon-128.png"
  },
  "action": {
    "default_popup": "windows/client.html",
    "default_title": "Rest Easy",
    "default_icon": "branding/icon-48.png"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2d98f2a1-7c6e-4b5d-9a0f-1e2d3c4b5a6f}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}