shimmie2/themes/danbooru2/ext_manager.theme.php

<?php

class CustomExtManagerTheme extends ExtManagerTheme {
	/**
	 * @param Page $page
	 * @param array $extensions
	 * @param bool $editable
	 */
	public function display_table(Page $page, /*array*/ $extensions, /*bool*/ $editable) {
		$page->disable_left();
		parent::display_table($page, $extensions, $editable);
	}

	/**
	 * @param Page $page
	 * @param ExtensionInfo $info
	 */
	public function display_doc(Page $page, ExtensionInfo $info) {
		$page->disable_left();
		parent::display_doc($page, $info);
	}
}