src/vs/workbench/services/extensionManagement/common/webExtensionsScannerService.ts/WebExtensionsScannerService/addWebExtension
class WebExtensionsScannerService:	private async addWebExtension(webExtension: IWebExtension) {
		const extension = await this.toExtension(webExtension, false);
		const installedExtensions = await this.readInstalledExtensions();
		installedExtensions.push(webExtension);
		await this.writeInstalledExtensions(installedExtensions);
		return extension;
	}