diff --git a/desktop/src/api/books/books.controller.ts b/desktop/src/api/books/books.controller.ts
index 5d07549..d8f7a8a 100644
--- a/desktop/src/api/books/books.controller.ts
+++ b/desktop/src/api/books/books.controller.ts
@@ -87,15 +87,16 @@ export async function getChapters(req: any, reply: FastifyReply) {
     try {
         const { id } = req.params;
         const source = req.query.source || 'anilist';
+        const provider = req.query.provider;
 
         const isExternal = source !== 'anilist';
-        return await booksService.getChaptersForBook(id, isExternal);
-    } catch {
+        return await booksService.getChaptersForBook(id, isExternal, provider);
+    } catch (err) {
+        console.error(err);
         return { chapters: [] };
     }
 }
 
-
 export async function getChapterContent(req: any, reply: FastifyReply) {
     try {
         const { bookId, chapter, provider } = req.params;
diff --git a/desktop/src/scripts/books/book.js b/desktop/src/scripts/books/book.js
index c649e84..22f2cb6 100644
--- a/desktop/src/scripts/books/book.js
+++ b/desktop/src/scripts/books/book.js
@@ -6,6 +6,8 @@ let bookSlug = null;
 let allChapters = [];
 let filteredChapters = [];
 
+let availableExtensions = [];
+
 const chapterPagination = Object.create(PaginationManager);
 chapterPagination.init(12, () => renderChapterTable());
 
@@ -16,7 +18,6 @@ document.addEventListener('DOMContentLoaded', () => {
 
 async function init() {
     try {
-
         const urlData = URLUtils.parseEntityPath('book');
         if (!urlData) {
             showError("Book Not Found");
@@ -29,6 +30,7 @@ async function init() {
 
         await loadBookMetadata();
 
+        await loadAvailableExtensions();
         await loadChapters();
 
         await setupAddToListButton();
@@ -39,11 +41,23 @@ async function init() {
     }
 }
 
+async function loadAvailableExtensions() {
+    try {
+        const res = await fetch('/api/extensions/book');
+        const data = await res.json();
+        availableExtensions = data.extensions || [];
+
+        setupProviderFilter();
+    } catch (err) {
+        console.error("Error fetching extensions:", err);
+    }
+}
+
 async function loadBookMetadata() {
     const source = extensionName || 'anilist';
     const fetchUrl = `/api/book/${bookId}?source=${source}`;
 
-    const res = await fetch(fetchUrl, { headers: AuthUtils.getSimpleAuthHeaders() });
+    const res = await fetch(fetchUrl);
     const data = await res.json();
 
     if (data.error || !data) {
@@ -154,17 +168,27 @@ function updateCustomAddButton() {
     }
 }
 
-async function loadChapters() {
+async function loadChapters(targetProvider = null) {
     const tbody = document.getElementById('chapters-body');
     if (!tbody) return;
 
-    tbody.innerHTML = '<tr><td colspan="4" style="text-align:center; padding: 2rem;">Searching extensions for chapters...</td></tr>';
+    // Si no se pasa provider, intentamos pillar el del select o el primero disponible
+    if (!targetProvider) {
+        const select = document.getElementById('provider-filter');
+        targetProvider = select ? select.value : (availableExtensions[0] || 'all');
+    }
+
+    tbody.innerHTML = '<tr><td colspan="4" style="text-align:center; padding: 2rem;">Searching extension for chapters...</td></tr>';
 
     try {
         const source = extensionName || 'anilist';
-        const fetchUrl = `/api/book/${bookId}/chapters?source=${source}`;
+        // Añadimos el query param 'provider' para que el backend filtre
+        let fetchUrl = `/api/book/${bookId}/chapters?source=${source}`;
+        if (targetProvider !== 'all') {
+            fetchUrl += `&provider=${targetProvider}`;
+        }
 
-        const res = await fetch(fetchUrl, { headers: AuthUtils.getSimpleAuthHeaders() });
+        const res = await fetch(fetchUrl);
         const data = await res.json();
 
         allChapters = data.chapters || [];
@@ -175,18 +199,17 @@ async function loadChapters() {
         const totalEl = document.getElementById('total-chapters');
 
         if (allChapters.length === 0) {
-            tbody.innerHTML = '<tr><td colspan="4" style="text-align:center; padding: 2rem;">No chapters found on loaded extensions.</td></tr>';
+            tbody.innerHTML = '<tr><td colspan="4" style="text-align:center; padding: 2rem;">No chapters found.</td></tr>';
             if (totalEl) totalEl.innerText = "0 Found";
             return;
         }
 
         if (totalEl) totalEl.innerText = `${allChapters.length} Found`;
 
-        setupProviderFilter();
-
         setupReadButton();
 
         chapterPagination.setTotalItems(filteredChapters.length);
+        chapterPagination.reset();
         renderChapterTable();
 
     } catch (err) {
@@ -211,44 +234,31 @@ function applyChapterFilter() {
 
 function setupProviderFilter() {
     const select = document.getElementById('provider-filter');
-    if (!select) return;
-
-    const providers = [...new Set(allChapters.map(ch => ch.provider))];
-
-    if (providers.length === 0) return;
+    if (!select || availableExtensions.length === 0) return;
 
     select.style.display = 'inline-block';
-    select.innerHTML = '<option value="all">All Providers</option>';
+    select.innerHTML = '';
 
-    providers.forEach(prov => {
+    const allOpt = document.createElement('option');
+    allOpt.value = 'all';
+    allOpt.innerText = 'Load All (Slower)';
+    select.appendChild(allOpt);
+
+    availableExtensions.forEach(ext => {
         const opt = document.createElement('option');
-        opt.value = prov;
-        opt.innerText = prov;
+        opt.value = ext;
+        opt.innerText = ext.charAt(0).toUpperCase() + ext.slice(1);
         select.appendChild(opt);
     });
 
-    if (extensionName) {
-        const extensionProvider = providers.find(
-            p => p.toLowerCase() === extensionName.toLowerCase()
-        );
-
-        if (extensionProvider) {
-            select.value = extensionProvider;
-            filteredChapters = allChapters.filter(ch => ch.provider === extensionProvider);
-        }
+    if (extensionName && availableExtensions.includes(extensionName)) {
+        select.value = extensionName;
+    } else if (availableExtensions.length > 0) {
+        select.value = availableExtensions[0];
     }
 
-    select.onchange = (e) => {
-        const selected = e.target.value;
-        if (selected === 'all') {
-            filteredChapters = [...allChapters];
-        } else {
-            filteredChapters = allChapters.filter(ch => ch.provider === selected);
-        }
-
-        chapterPagination.reset();
-        chapterPagination.setTotalItems(filteredChapters.length);
-        renderChapterTable();
+    select.onchange = () => {
+        loadChapters(select.value);
     };
 }
 
diff --git a/docker/src/api/books/books.controller.ts b/docker/src/api/books/books.controller.ts
index 5d07549..d8f7a8a 100644
--- a/docker/src/api/books/books.controller.ts
+++ b/docker/src/api/books/books.controller.ts
@@ -87,15 +87,16 @@ export async function getChapters(req: any, reply: FastifyReply) {
     try {
         const { id } = req.params;
         const source = req.query.source || 'anilist';
+        const provider = req.query.provider;
 
         const isExternal = source !== 'anilist';
-        return await booksService.getChaptersForBook(id, isExternal);
-    } catch {
+        return await booksService.getChaptersForBook(id, isExternal, provider);
+    } catch (err) {
+        console.error(err);
         return { chapters: [] };
     }
 }
 
-
 export async function getChapterContent(req: any, reply: FastifyReply) {
     try {
         const { bookId, chapter, provider } = req.params;
diff --git a/docker/src/scripts/books/book.js b/docker/src/scripts/books/book.js
index c649e84..22f2cb6 100644
--- a/docker/src/scripts/books/book.js
+++ b/docker/src/scripts/books/book.js
@@ -6,6 +6,8 @@ let bookSlug = null;
 let allChapters = [];
 let filteredChapters = [];
 
+let availableExtensions = [];
+
 const chapterPagination = Object.create(PaginationManager);
 chapterPagination.init(12, () => renderChapterTable());
 
@@ -16,7 +18,6 @@ document.addEventListener('DOMContentLoaded', () => {
 
 async function init() {
     try {
-
         const urlData = URLUtils.parseEntityPath('book');
         if (!urlData) {
             showError("Book Not Found");
@@ -29,6 +30,7 @@ async function init() {
 
         await loadBookMetadata();
 
+        await loadAvailableExtensions();
         await loadChapters();
 
         await setupAddToListButton();
@@ -39,11 +41,23 @@ async function init() {
     }
 }
 
+async function loadAvailableExtensions() {
+    try {
+        const res = await fetch('/api/extensions/book');
+        const data = await res.json();
+        availableExtensions = data.extensions || [];
+
+        setupProviderFilter();
+    } catch (err) {
+        console.error("Error fetching extensions:", err);
+    }
+}
+
 async function loadBookMetadata() {
     const source = extensionName || 'anilist';
     const fetchUrl = `/api/book/${bookId}?source=${source}`;
 
-    const res = await fetch(fetchUrl, { headers: AuthUtils.getSimpleAuthHeaders() });
+    const res = await fetch(fetchUrl);
     const data = await res.json();
 
     if (data.error || !data) {
@@ -154,17 +168,27 @@ function updateCustomAddButton() {
     }
 }
 
-async function loadChapters() {
+async function loadChapters(targetProvider = null) {
     const tbody = document.getElementById('chapters-body');
     if (!tbody) return;
 
-    tbody.innerHTML = '<tr><td colspan="4" style="text-align:center; padding: 2rem;">Searching extensions for chapters...</td></tr>';
+    // Si no se pasa provider, intentamos pillar el del select o el primero disponible
+    if (!targetProvider) {
+        const select = document.getElementById('provider-filter');
+        targetProvider = select ? select.value : (availableExtensions[0] || 'all');
+    }
+
+    tbody.innerHTML = '<tr><td colspan="4" style="text-align:center; padding: 2rem;">Searching extension for chapters...</td></tr>';
 
     try {
         const source = extensionName || 'anilist';
-        const fetchUrl = `/api/book/${bookId}/chapters?source=${source}`;
+        // Añadimos el query param 'provider' para que el backend filtre
+        let fetchUrl = `/api/book/${bookId}/chapters?source=${source}`;
+        if (targetProvider !== 'all') {
+            fetchUrl += `&provider=${targetProvider}`;
+        }
 
-        const res = await fetch(fetchUrl, { headers: AuthUtils.getSimpleAuthHeaders() });
+        const res = await fetch(fetchUrl);
         const data = await res.json();
 
         allChapters = data.chapters || [];
@@ -175,18 +199,17 @@ async function loadChapters() {
         const totalEl = document.getElementById('total-chapters');
 
         if (allChapters.length === 0) {
-            tbody.innerHTML = '<tr><td colspan="4" style="text-align:center; padding: 2rem;">No chapters found on loaded extensions.</td></tr>';
+            tbody.innerHTML = '<tr><td colspan="4" style="text-align:center; padding: 2rem;">No chapters found.</td></tr>';
             if (totalEl) totalEl.innerText = "0 Found";
             return;
         }
 
         if (totalEl) totalEl.innerText = `${allChapters.length} Found`;
 
-        setupProviderFilter();
-
         setupReadButton();
 
         chapterPagination.setTotalItems(filteredChapters.length);
+        chapterPagination.reset();
         renderChapterTable();
 
     } catch (err) {
@@ -211,44 +234,31 @@ function applyChapterFilter() {
 
 function setupProviderFilter() {
     const select = document.getElementById('provider-filter');
-    if (!select) return;
-
-    const providers = [...new Set(allChapters.map(ch => ch.provider))];
-
-    if (providers.length === 0) return;
+    if (!select || availableExtensions.length === 0) return;
 
     select.style.display = 'inline-block';
-    select.innerHTML = '<option value="all">All Providers</option>';
+    select.innerHTML = '';
 
-    providers.forEach(prov => {
+    const allOpt = document.createElement('option');
+    allOpt.value = 'all';
+    allOpt.innerText = 'Load All (Slower)';
+    select.appendChild(allOpt);
+
+    availableExtensions.forEach(ext => {
         const opt = document.createElement('option');
-        opt.value = prov;
-        opt.innerText = prov;
+        opt.value = ext;
+        opt.innerText = ext.charAt(0).toUpperCase() + ext.slice(1);
         select.appendChild(opt);
     });
 
-    if (extensionName) {
-        const extensionProvider = providers.find(
-            p => p.toLowerCase() === extensionName.toLowerCase()
-        );
-
-        if (extensionProvider) {
-            select.value = extensionProvider;
-            filteredChapters = allChapters.filter(ch => ch.provider === extensionProvider);
-        }
+    if (extensionName && availableExtensions.includes(extensionName)) {
+        select.value = extensionName;
+    } else if (availableExtensions.length > 0) {
+        select.value = availableExtensions[0];
     }
 
-    select.onchange = (e) => {
-        const selected = e.target.value;
-        if (selected === 'all') {
-            filteredChapters = [...allChapters];
-        } else {
-            filteredChapters = allChapters.filter(ch => ch.provider === selected);
-        }
-
-        chapterPagination.reset();
-        chapterPagination.setTotalItems(filteredChapters.length);
-        renderChapterTable();
+    select.onchange = () => {
+        loadChapters(select.value);
     };
 }