diff --git a/i18n/en.jsonp.js b/i18n/en.jsonp.js
index 10b47472..bf12d49f 100644
--- a/i18n/en.jsonp.js
+++ b/i18n/en.jsonp.js
@@ -66,6 +66,9 @@ document.localeJson = {
       "configure-display-apptheme-info": "[ Show article with applied theme ]",
       "configure-language-selector-default": "Language",
       "configure-language-selector-other": "More soon...",
+      "configure-library-mirrors": "Library Mirrors",
+      "configure-library-altlibrary": "The library at",
+      "configure-library-unreachable": "appears to be unreachable. Please try one of these mirrors:",
       "configure-performance-settings-title": "Performance / compatibility",
       "configure-performance-panel-header": "Caching and preview settings",
       "configure-performance-cacheassets-description": "Kiwix JS can speed up the display of articles by caching assets:",
diff --git a/i18n/es.jsonp.js b/i18n/es.jsonp.js
index 07e42a9e..5c8f8202 100644
--- a/i18n/es.jsonp.js
+++ b/i18n/es.jsonp.js
@@ -66,6 +66,9 @@ document.localeJson = {
       "configure-display-apptheme-info": "[ Mostrar artículo con tema seleccionado ]",
       "configure-language-selector-default": "Idioma",
       "configure-language-selector-other": "Más pronto...",
+      "configure-library-mirrors": "Espejos de la biblioteca",
+      "configure-library-altlibrary": "La biblioteca en",
+      "configure-library-unreachable": "parece ser inalcanzable. Por favor, pruebe uno de estos espejos:",
       "configure-performance-settings-title": "Rendimiento y compatibilidad",
       "configure-performance-panel-header": "Ajustes de caché y vista previa",
       "configure-performance-cacheassets-description": "Kiwix JS puede acelerar la visualización de artículos almacenando en caché los activos:",
diff --git a/i18n/fr.jsonp.js b/i18n/fr.jsonp.js
index 0f6fec12..c1805be6 100644
--- a/i18n/fr.jsonp.js
+++ b/i18n/fr.jsonp.js
@@ -66,6 +66,9 @@ document.localeJson = {
       "configure-display-apptheme-info": "[ Afficher l'article avec le thème sélectionné ]",
       "configure-language-selector-default": "Langue",
       "configure-language-selector-other": "Bientôt plus...",
+      "configure-library-mirrors": "Miroirs de bibliothèque",
+      "configure-library-altlibrary": "La bibliothèque à",
+      "configure-library-unreachable": "semble être inaccessible. Veuillez essayer un de ces miroirs :",
       "configure-performance-settings-title": "Performances et compatibilité",
       "configure-performance-panel-header": "Mise en caché et prévisualisation",
       "configure-performance-cacheassets-description": "Kiwix JS peut accélérer l'affichage des articles en mettant en cache les ressources :",
diff --git a/www/index.html b/www/index.html
index 9ff6e4ad..9bf43f63 100644
--- a/www/index.html
+++ b/www/index.html
@@ -6,7 +6,7 @@
         <title>Kiwix</title>
         <meta name="description" content="Offline Wikipedia reader">
         <meta name="viewport" content="width=device-width, initial-scale=1.0">
-        <meta http-equiv="Content-Security-Policy" content="default-src 'self' data: file: blob: about: https://download.kiwix.org https://master.download.kiwix.org https://browser-extension.kiwix.org https://kiwix.github.io 'unsafe-inline' 'unsafe-eval'; frame-src 'self' moz-extension: chrome-extension:; object-src 'none';">
+        <meta http-equiv="Content-Security-Policy" content="default-src 'self' data: file: blob: about: https://download.kiwix.org https://master.download.kiwix.org https://library.kiwix.org https://browser-extension.kiwix.org https://kiwix.github.io 'unsafe-inline' 'unsafe-eval'; frame-src 'self' moz-extension: chrome-extension:; object-src 'none';">
         <meta name="referrer" content="none">
         <!--
         Kiwix (offline Wikipedia reader) - HTML5/Javascript version
diff --git a/www/js/app.js b/www/js/app.js
index 1a1ac4cd..cdd25e34 100644
--- a/www/js/app.js
+++ b/www/js/app.js
@@ -1792,20 +1792,37 @@ async function handleFileDrop (packet) {
 const btnLibrary = document.getElementById('btnLibrary');
 btnLibrary.addEventListener('click', function (e) {
     e.preventDefault();
-
     const libraryContent = document.getElementById('libraryContent');
-    const iframe = libraryContent.contentWindow.document.getElementById('libraryIframe');
-    try {
-        // eslint-disable-next-line no-new-func
-        Function('try{}catch{}')();
-        iframe.setAttribute('src', params.libraryUrl);
-        uiUtil.tabTransitionToSection('library', params.showUIAnimations);
-        resizeIFrame();
-    } catch (error) {
-        window.open(params.altLibraryUrl, '_blank')
-    }
+    const libraryIframe = libraryContent.contentWindow.document.getElementById('libraryIframe');
+    libraryIframe.src = 'about:blank'; // Empty the iframe
+    const xhr = new XMLHttpRequest();
+    xhr.open('HEAD', params.libraryUrl, true);
+    xhr.onreadystatechange = function () {
+        if (xhr.readyState === 4) {
+            if (xhr.status >= 200 && xhr.status < 300) {
+                try {
+                    // eslint-disable-next-line no-new-func
+                    Function('try{}catch{}')(); // Tests the browser can run code that will be used by the library
+                    libraryIframe.setAttribute('src', params.libraryUrl);
+                    uiUtil.tabTransitionToSection('library', params.showUIAnimations);
+                    resizeIFrame();
+                } catch (error) {
+                    console.warn('Browser cannot run code in the library iframe', error);
+                    handleLibraryError(libraryIframe);
+                }
+            } else {
+                console.warn('Library server ' + params.libraryUrl + ' is unreachable...');
+                handleLibraryError(libraryIframe);
+            }
+        }
+    };
+    xhr.onerror = function () {
+        handleLibraryError(libraryIframe);
+    };
+    xhr.send();
+    uiUtil.tabTransitionToSection('library', params.showUIAnimations);
+    resizeIFrame();
 });
-
 // Add keyboard activation for library button
 btnLibrary.addEventListener('keydown', function (e) {
     if (e.key === 'Enter' || e.key === ' ' || e.keyCode === 32) {
@@ -1813,7 +1830,44 @@ btnLibrary.addEventListener('keydown', function (e) {
         btnLibrary.click();
     }
 });
-
+// Error handler for library iframe
+function handleLibraryError (iframe) {
+    iframe.onload = function () {
+        iframe.onload = null;
+        setTimeout(function () {
+            try {
+                if (!iframe.contentWindow || !iframe.contentWindow.document) {
+                    console.warn('Library server ' + params.altLibraryUrl + ' is unreachable...');
+                    throw new Error('Iframe content not accessible');
+                }
+            } catch (error) {
+                let htmlDoc = '<html><head><title>';
+                htmlDoc += translateUI.t('configure-library-mirrors') || 'Library Mirrors';
+                htmlDoc += '</title></head><body><h1>';
+                htmlDoc += translateUI.t('configure-library-mirrors') || 'Library Mirrors';
+                htmlDoc += '</h1><p style="font-size: large;">'
+                htmlDoc += translateUI.t('configure-library-altlibrary') || 'The library at';
+                htmlDoc += ' ' + params.altLibraryUrl + ' ';
+                htmlDoc += translateUI.t('configure-library-unreachable') || 'appears to be unreachable. Please try one of these mirrors:';
+                htmlDoc += '</p><ul>';
+                params.kiwixDownloadMirrors.forEach(function (mirror) {
+                    htmlDoc += '<li style="font-size: large;" class="console"><a href="' + mirror + '" target="_blank">' + mirror.replace(/^([^/]+\/\/[^/]+).*/, '$1') + '</a></li>';
+                });
+                htmlDoc += '</ul></body></html>';
+                iframe.onload = function () {
+                    iframe.onload = null;
+                    iframe.contentWindow.document.open();
+                    iframe.contentWindow.document.write(htmlDoc);
+                    iframe.contentWindow.document.close();
+                    uiUtil.tabTransitionToSection('library', params.showUIAnimations);
+                    resizeIFrame();
+                }
+                iframe.src = 'about:blank';
+            }
+        }, 500); // Adjust the timeout if too long
+    };
+    iframe.setAttribute('src', params.altLibraryUrl);
+};
 // Add event listener to link which allows user to show file selectors
 document.getElementById('selectorsDisplayLink').addEventListener('click', function (e) {
     e.preventDefault();
diff --git a/www/js/init.js b/www/js/init.js
index dcf7eaaf..f5f10fd0 100644
--- a/www/js/init.js
+++ b/www/js/init.js
@@ -124,6 +124,9 @@ params['contentInjectionMode'] = getSetting('contentInjectionMode') ||
 params['useCanvasElementsForWebpTranscoding'] = null; // Value is determined in uiUtil.determineCanvasElementsWorkaround(), called when setting the content injection mode
 params['libraryUrl'] = 'https://library.kiwix.org/'; // Url for iframe that will be loaded to download new zim files
 params['altLibraryUrl'] = 'https://download.kiwix.org/zim/'; // Alternative Url for iframe (for use with unsupported browsers) that will be loaded to download new zim files
+params['kiwixDownloadMirrors'] = ['https://ftp.fau.de/kiwix/zim/', 'https://mirrors.dotsrc.org/kiwix/zim/',
+    'https://www.mirrorservice.org/sites/download.kiwix.org/zim/', 'https://md.mirrors.hacktegic.com/kiwix-md/zim/',
+    'https://laotzu.ftp.acc.umu.se/mirror/kiwix.org/zim/', 'https://saimei.ftp.acc.umu.se/mirror/kiwix.org/zim/'];
 params['cacheAPI'] = 'kiwix-js'; // Sets name of the prefix used to identify the cache in Cache API
 params['cacheIDB'] = 'kiwix-zim'; // Sets name of the Indexed DB database
 params['isFileSystemApiSupported'] = typeof window.showOpenFilePicker === 'function'; // Sets a boolean indicating whether the FileSystem API is supported