diff --git a/addons/website/static/src/client_actions/website_preview/website_preview.js b/addons/website/static/src/client_actions/website_preview/website_preview.js
index b30d6b8e27e..b13ea32e837 100644
--- a/addons/website/static/src/client_actions/website_preview/website_preview.js
+++ b/addons/website/static/src/client_actions/website_preview/website_preview.js
@@ -419,6 +419,21 @@ export class WebsitePreview extends Component {
         });
     }
 
+    /**
+     * This method is called when the page is unloaded to clean
+     * the iframefallback content.
+     */
+    _cleanIframeFallback() {
+        // Remove autoplay in all media video iframes urls so videos are not
+        // playing in the background
+        const iframesEl = this.iframefallback.el.contentDocument.querySelectorAll(".media_iframe_video iframe");
+        for (const iframeEl of iframesEl) {
+            const url = new URL(iframeEl.src);
+            url.searchParams.delete('autoplay');
+            iframeEl.src = url.toString();
+        }
+    }
+
     _onPageUnload() {
         this.iframe.el.setAttribute('is-ready', 'false');
         // Before leaving the iframe, its content is replicated on an
@@ -431,6 +446,7 @@ export class WebsitePreview extends Component {
             this.iframefallback.el.contentDocument.body.replaceWith(this.iframe.el.contentDocument.body.cloneNode(true));
             this.iframefallback.el.classList.remove('d-none');
             $().getScrollingElement(this.iframefallback.el.contentDocument)[0].scrollTop = $().getScrollingElement(this.iframe.el.contentDocument)[0].scrollTop;
+            this._cleanIframeFallback();
         }
     }
     _onPageHide() {
diff --git a/addons/website_slides/__manifest__.py b/addons/website_slides/__manifest__.py
index 59fc539da0e..be125b6fefb 100644
--- a/addons/website_slides/__manifest__.py
+++ b/addons/website_slides/__manifest__.py
@@ -72,6 +72,7 @@ Featuring
     'assets': {
         'web.assets_backend': [
             'website_slides/static/src/activity/**/*',
+            'website_slides/static/src/client_actions/website_preview/website_preview.js',
             'website_slides/static/src/slide_category_one2many_field.js',
             'website_slides/static/src/slide_category_list_renderer.js',
             'website_slides/static/src/scss/slide_views.scss',
diff --git a/addons/website_slides/static/src/client_actions/website_preview/website_preview.js b/addons/website_slides/static/src/client_actions/website_preview/website_preview.js
new file mode 100644
index 00000000000..8b53487dd8b
--- /dev/null
+++ b/addons/website_slides/static/src/client_actions/website_preview/website_preview.js
@@ -0,0 +1,21 @@
+/** @odoo-module **/
+
+import { patch } from 'web.utils';
+import { WebsitePreview } from '@website/client_actions/website_preview/website_preview';
+
+patch(WebsitePreview.prototype, 'website_slides_website_preview', {
+    /**
+     * @override
+     */
+    _cleanIframeFallback() {
+        // Remove autoplay in all youtube videos urls so videos are not playing
+        // in the background
+        const playersEl = this.iframefallback.el.contentDocument.querySelectorAll('[id^=youtube-player]');
+        for (const playerEl of playersEl) {
+            const url = new URL(playerEl.src);
+            url.searchParams.delete('autoplay');
+            playerEl.src = url.toString();
+        }
+        return this._super(...arguments);
+    }
+});