src/vs/workbench/services/extensionManagement/browser/webExtensionsScannerService.ts/WebExtensionsScannerService/getExtensionManifest
class WebExtensionsScannerService:	private async getExtensionManifest(location: URI): Promise<IExtensionManifest> {
		const url = joinPath(location, 'package.json');
		const content = await this.extensionResourceLoaderService.readExtensionResource(url);
		return JSON.parse(content);
	}