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 aae14db8e00..85329f8d61c 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
@@ -10,6 +10,7 @@ import { unslugHtmlDataObject } from '../../services/website_service';
 import {OptimizeSEODialog} from '@website/components/dialog/seo';
 import { routeToUrl } from "@web/core/browser/router_service";
 import { getActiveHotkey } from "@web/core/hotkeys/hotkey_service";
+import wUtils from 'website.utils';
 
 const { Component, onWillStart, onMounted, onWillUnmount, useRef, useEffect, useState } = owl;
 
@@ -53,7 +54,16 @@ export class WebsitePreview extends Component {
             this.backendWebsiteId = unslugHtmlDataObject(backendWebsiteRepr).id;
 
             const encodedPath = encodeURIComponent(this.path);
-            if (this.websiteDomain && this.websiteDomain !== window.location.origin) {
+            if (this.websiteDomain && !wUtils.isHTTPSorNakedDomainRedirection(this.websiteDomain, window.location.origin)) {
+                // The website domain might be the naked one while the naked one
+                // is actually redirecting to `www` (or the other way around).
+                // In such a case, we need to consider those 2 from the same
+                // domain and let the iframe load that "different" domain. The
+                // iframe will actually redirect to the correct one (naked/www),
+                // which will ends up with the same domain as the parent window
+                // URL (event if it wasn't, it wouldn't be an issue as those are
+                // really considered as the same domain, the user will share the
+                // same session and CORS errors won't be a thing in such a case)
                 window.location.href = `${this.websiteDomain}/web#action=website.website_preview&path=${encodedPath}&website_id=${this.websiteId}`;
             } else {
                 this.initialUrl = `/website/force/${this.websiteId}?path=${encodedPath}`;
diff --git a/addons/website/static/src/js/utils.js b/addons/website/static/src/js/utils.js
index 75cef2c55c2..294c57dacd7 100644
--- a/addons/website/static/src/js/utils.js
+++ b/addons/website/static/src/js/utils.js
@@ -239,6 +239,28 @@ function websiteDomain(self) {
     return ['|', ['website_id', '=', false], ['website_id', '=', websiteID]];
 }
 
+/**
+ * Checks if the 2 given URLs are the same, to prevent redirecting uselessly
+ * from one to another.
+ * It will consider naked URL and `www` URL as the same URL.
+ * It will consider `https` URL `http` URL as the same URL.
+ *
+ * @param {string} url1
+ * @param {string} url2
+ * @returns {Boolean}
+ */
+function isHTTPSorNakedDomainRedirection(url1, url2) {
+    try {
+        url1 = new URL(url1).host;
+        url2 = new URL(url2).host;
+    } catch {
+        // Incorrect URL, `false` URL..
+        return false;
+    }
+    return url1 === url2 ||
+           url1.replace(/^www\./, '') === url2.replace(/^www\./, '');
+}
+
 function sendRequest(route, params) {
     function _addInput(form, name, value) {
         let param = document.createElement('input');
@@ -389,6 +411,7 @@ return {
     prompt: prompt,
     sendRequest: sendRequest,
     websiteDomain: websiteDomain,
+    isHTTPSorNakedDomainRedirection: isHTTPSorNakedDomainRedirection,
     svgToPNG: svgToPNG,
     generateGMapIframe: generateGMapIframe,
     generateGMapLink: generateGMapLink,
diff --git a/addons/website/static/src/systray_items/website_switcher.js b/addons/website/static/src/systray_items/website_switcher.js
index 4da8f3f7493..3283c26f263 100644
--- a/addons/website/static/src/systray_items/website_switcher.js
+++ b/addons/website/static/src/systray_items/website_switcher.js
@@ -4,6 +4,7 @@ import { registry } from "@web/core/registry";
 import { useService } from "@web/core/utils/hooks";
 import { Dropdown } from "@web/core/dropdown/dropdown";
 import { DropdownItem } from "@web/core/dropdown/dropdown_item";
+import wUtils from 'website.utils';
 
 const { Component } = owl;
 
@@ -17,7 +18,7 @@ export class WebsiteSwitcherSystray extends Component {
             name: website.name,
             id: website.id,
             callback: () => {
-                if (website.domain && website.domain !== window.location.origin) {
+                if (website.domain && !wUtils.isHTTPSorNakedDomainRedirection(website.domain, window.location.origin)) {
                     const { location: { pathname, search, hash } } = this.websiteService.contentWindow;
                     const path = pathname + search + hash;
                     window.location.href = `${website.domain}/web#action=website.website_preview&path=${encodeURI(path)}&website_id=${website.id}`;