Add a `product.json` and set the extension gallery URL through that
```
{
"extensionsGallery": {
"serviceUrl": "https://marketplace.visualstudio.com/_apis/public/gallery",
"itemUrl": "https://marketplace.visualstudio.com/items",
"cacheUrl": "https://vscode.blob.core.windows.net/gallery/index",
}
}
```
https://github.com/getcursor/cursor/issues/2195
This is technically against the ToS of the extension gallery though
