jellyfin-web/src/controllers/dashboard/plugins/installed/index.html

<div id="pluginsPage" data-role="page" class="page type-interior pluginConfigurationPage withTabs fullWidthContent">
    <div>
        <div class="content-primary">
            <div class="inputContainer">
                <label class="inputLabel" for="txtSearchPlugins">${Search}</label>
                <input id="txtSearchPlugins" name="txtSearchPlugins" type="text" is="emby-input" class="emby-input">
            </div>
            <div class="installedPlugins"></div>
        </div>
    </div>
</div>