src/vs/workbench/contrib/extensions/browser/extensionsViews.ts/ExtensionsListView/renderHeader
class ExtensionsListView:	protected override renderHeader(container: HTMLElement): void {
		container.classList.add('extension-view-header');
		super.renderHeader(container);

		this.badge = new CountBadge(append(container, $('.count-badge-wrapper')));
		this._register(attachBadgeStyler(this.badge, this.themeService));
	}