diff --git a/xExtension-YouTube/configure.phtml b/xExtension-YouTube/configure.phtml
index 2a826a0..b9caf48 100644
--- a/xExtension-YouTube/configure.phtml
+++ b/xExtension-YouTube/configure.phtml
@@ -32,7 +32,7 @@ declare(strict_types=1);
 
 		<div class="group-controls">
 			<label class="checkbox" for="yt_nocookie">
-				<input type="checkbox" id="yt_nocookie" name="yt_nocookie" value="1" data-leave-validation="<?= intval($this->isUseNoCookieDomain()) ?>" <?= $this->isUseNoCookieDomain() ? 'checked="checked"' : '' ?> />
+				<input type="checkbox" id="yt_nocookie" name="yt_nocookie" data-leave-validation="<?= intval($this->isUseNoCookieDomain()) ?>" <?= $this->isUseNoCookieDomain() ? 'checked="checked"' : '' ?> />
 				<?= _t('ext.yt_videos.use_nocookie') ?>
 			</label>
 		</div>
diff --git a/xExtension-YouTube/extension.php b/xExtension-YouTube/extension.php
index 33f9888..26b9484 100644
--- a/xExtension-YouTube/extension.php
+++ b/xExtension-YouTube/extension.php
@@ -517,7 +517,7 @@ final class YouTubeExtension extends Minz_Extension
 			FreshRSS_Context::userConf()->_attribute('yt_player_width', Minz_Request::paramInt('yt_width'));
 			FreshRSS_Context::userConf()->_attribute('yt_show_content', Minz_Request::paramBoolean('yt_show_content'));
 			FreshRSS_Context::userConf()->_attribute('yt_download_channel_icons', Minz_Request::paramBoolean('yt_download_channel_icons'));
-			FreshRSS_Context::userConf()->_attribute('yt_nocookie', Minz_Request::paramInt('yt_nocookie'));
+			FreshRSS_Context::userConf()->_attribute('yt_nocookie', Minz_Request::paramBoolean('yt_nocookie'));
 			FreshRSS_Context::userConf()->save();
 		}
 
diff --git a/xExtension-YouTube/static/fetchIcons.js b/xExtension-YouTube/static/fetchIcons.js
index 0157718..13dab27 100755
--- a/xExtension-YouTube/static/fetchIcons.js
+++ b/xExtension-YouTube/static/fetchIcons.js
@@ -1,15 +1,15 @@
 'use strict';
 
-/* globals context */
+/* globals context, slider */
 
 function initFetchBtn() {
+  const i18n = context.extensions.yt_i18n;
+
   const fetchIcons = document.querySelector('button[value="iconFetchFinish"]');
   if (!fetchIcons) {
     return;
   }
 
-  const i18n = context.extensions.yt_i18n;
-
   document.querySelectorAll('#yt_action_btn').forEach(el => el.style.marginBottom = '1rem');
 
   fetchIcons.removeAttribute('disabled');
@@ -18,9 +18,15 @@ function initFetchBtn() {
   fetchIcons.onclick = function(e) {
     e.preventDefault();
 
+    const closeSlider = document.querySelector('#close-slider');
+    if (closeSlider) {
+      closeSlider.onclick = (e) => e.preventDefault();
+      closeSlider.style.cursor = 'not-allowed';
+    }
+
+    fetchIcons.form.onsubmit = window.onbeforeunload = (e) => e.preventDefault();
     fetchIcons.onclick = null;
     fetchIcons.disabled = true;
-    fetchIcons.form.onsubmit = (e) => e.preventDefault();
     fetchIcons.parentElement.insertAdjacentHTML('afterend', `
     <hr><br>
     <center>
@@ -34,7 +40,7 @@ function initFetchBtn() {
     const configureUrl = fetchIcons.form.action;
 
     function ajaxBody(action, args) {
-      return new URLSearchParams({
+      return JSON.stringify({
         '_csrf': context.csrf,
         'yt_action_btn': 'ajax' + action,
         ...args
@@ -42,10 +48,10 @@ function initFetchBtn() {
     }
 
     fetch(configureUrl, {
-      method: "POST",
+      method: 'POST',
       body: ajaxBody('GetYtFeeds'),
       headers: {
-        "Content-Type": "application/x-www-form-urlencoded"
+        'Content-Type': 'application/json; charset=UTF-8'
       }
     }).then(resp => {
       if (!resp.ok) {
@@ -56,17 +62,17 @@ function initFetchBtn() {
       let completed = 0;
       json.forEach(async (feed) => {
         await fetch(configureUrl, {
-          method: "POST",
+          method: 'POST',
           body: ajaxBody('FetchIcon', {'id': feed.id}),
           headers: {
-            "Content-Type": "application/x-www-form-urlencoded"
+            'Content-Type': 'application/json; charset=UTF-8'
           }
         }).then(async () => {
           iconFetchChannel.innerText = feed.title;
           iconFetchCount.innerText = `${++completed}/${json.length}`;
           if (completed === json.length) {
             fetchIcons.disabled = false;
-            fetchIcons.form.onsubmit = null;
+            fetchIcons.form.onsubmit = window.onbeforeunload = null;
             fetchIcons.click();
           }
         });
@@ -76,8 +82,8 @@ function initFetchBtn() {
 }
 
 window.addEventListener('load', function() {
-  if (document.querySelector('#slider')) {
-    document.querySelector('#slider').addEventListener('freshrss:slider-load', initFetchBtn);
+  if (typeof slider !== 'undefined') {
+    slider.addEventListener('freshrss:slider-load', initFetchBtn);
   }
   initFetchBtn();
 });