diff --git a/showmore_dyn/showmore_dyn.js b/showmore_dyn/showmore_dyn.js
index 4b32b2d3..74803d2d 100644
--- a/showmore_dyn/showmore_dyn.js
+++ b/showmore_dyn/showmore_dyn.js
@@ -6,15 +6,14 @@ $(document).ready(function() {
 		return;
 	}
 
-	$("head").append('<style type="text/css"></style>');
-	var newStyleElement = $("head").children(':last');
-	newStyleElement.html('.limit-height{max-height: ' + postLimitHeight + 'px; overflow: hidden; }');
-
-	handleNewWallItemBodies();
-
-	document.addEventListener("postprocess_liveupdate", function() {
+	if (postLimitHeight) {
+		$('head').append('<style type="text/css">.limit-height{max-height: ' + postLimitHeight + 'px; overflow: hidden; }</style>');
 		handleNewWallItemBodies();
-	});
+
+		document.addEventListener('postprocess_liveupdate', function() {
+			handleNewWallItemBodies();
+		});
+	}
 });
 
 function handleNewWallItemBodies() {
diff --git a/showmore_dyn/showmore_dyn.php b/showmore_dyn/showmore_dyn.php
index 32aedb08..ccb96bc6 100644
--- a/showmore_dyn/showmore_dyn.php
+++ b/showmore_dyn/showmore_dyn.php
@@ -41,10 +41,7 @@ function showmore_dyn_settings_post()
 	}
 
 	if (isset($_POST['showmore_dyn-submit'])) {
-		$limitHeight = $_POST['limitHeight'];
-		if ($limitHeight && is_numeric($limitHeight)) {
-			DI::pConfig()->set(local_user(), 'showmore_dyn', 'limitHeight', $limitHeight);
-		}
+		DI::pConfig()->set(local_user(), 'showmore_dyn', 'limitHeight', $_POST['limitHeight'] ?? 0);
 	}
 }
 
@@ -61,14 +58,14 @@ function showmore_dyn_settings(App &$a, &$o)
 	$o .= Renderer::replaceMacros($t, [
 		'$submit' => DI::l10n()->t('Save Settings'),
 		'$title' => 'Showmore Dynamic',
-		'$limitHeight' => ['limitHeight', DI::l10n()->t('Limit Height'), $limitHeight, 'The maximal height of posts when collapsed', '', '', 'number'],
+		'$limitHeight' => ['limitHeight', DI::l10n()->t('Limit Height'), $limitHeight, 'The maximal pixel height of posts, 0 to disable', '', '', 'number'],
 	]);
 
 }
 
 function showmore_dyn_script()
 {
-	$limitHeight = DI::pConfig()->get(local_user(), 'showmore_dyn', 'limitHeight', 250);
+	$limitHeight = intval(DI::pConfig()->get(local_user(), 'showmore_dyn', 'limitHeight', 250));
 	$showmore_dyn_showmore_linktext = DI::l10n()->t('Show more ...');
 	DI::page()['htmlhead'] .= <<<EOT
 <script>