src/vs/workbench/contrib/extensions/browser/extensionsWorkbenchService.ts/Extension/publisherUrl
class Extension:	get publisherUrl(): URI | undefined {
		if (!this.productService.extensionsGallery || !this.gallery) {
			return undefined;
		}

		return resources.joinPath(URI.parse(this.productService.extensionsGallery.publisherUrl), this.publisher);
	}