diff --git a/src/background.ts b/src/background.ts
index 0aa331b8..04da8de2 100644
--- a/src/background.ts
+++ b/src/background.ts
@@ -14,52 +14,203 @@ function reloadSeqtaPages() {
   result.then(open, console.error);
 }
 
-// @ts-ignore
-browser.runtime.onMessage.addListener(
-  (request: any, _: any, sendResponse: (response?: any) => void) => {
-    switch (request.type) {
-      case "reloadTabs":
-        reloadSeqtaPages();
-        break;
+/** Callback for sending a response back to the message sender */
+type MessageSender = { (response?: unknown): void };
 
-      case "extensionPages":
-        browser.tabs.query({}).then(function (tabs) {
-          for (let tab of tabs) {
-            if (tab.url?.includes("chrome-extension://")) {
-              browser.tabs.sendMessage(tab.id!, request);
-            }
-          }
+function handleFetchThemes(request: any, sendResponse: MessageSender): boolean {
+  const { token } = request;
+  const apiUrl = `https://betterseqta.org/api/themes?type=betterseqta&limit=100&nocache=${Date.now()}`;
+  const githubUrl = `https://raw.githubusercontent.com/BetterSEQTA/BetterSEQTA-Themes/main/store/themes.json?nocache=${Date.now()}`;
+  const headers: Record<string, string> = {};
+  if (token) headers["Authorization"] = `Bearer ${token}`;
+  fetch(apiUrl, { cache: "no-store", headers })
+    .then((r) => r.json())
+    .then(sendResponse)
+    .catch((err) => {
+      console.warn("[Background] fetchThemes API failed, trying GitHub fallback:", err?.message);
+      fetch(githubUrl, { cache: "no-store" })
+        .then((r) => r.json())
+        .then((data) => sendResponse({ success: true, data: { themes: data.themes ?? [] } }))
+        .catch((fallbackErr) => {
+          console.error("[Background] fetchThemes GitHub fallback error:", fallbackErr);
+          sendResponse({ success: false, error: fallbackErr?.message });
         });
-        break;
+    });
+  return true;
+}
 
-      case "currentTab":
-        browser.tabs
-          .query({ active: true, currentWindow: true })
-          .then(function (tabs) {
-            browser.tabs
-              .sendMessage(tabs[0].id!, request)
-              .then(function (response) {
-                sendResponse(response);
-              });
-          });
-        return true;
+function handleFetchThemeDetails(request: any, sendResponse: MessageSender): boolean {
+  const { themeId, token } = request;
+  if (!themeId || typeof themeId !== "string") {
+    sendResponse({ success: false, error: "Missing themeId" });
+    return false;
+  }
+  const headers: Record<string, string> = {};
+  if (token) headers["Authorization"] = `Bearer ${token}`;
+  fetch(`https://betterseqta.org/api/themes/${themeId}`, { cache: "no-store", headers })
+    .then((r) => r.json())
+    .then(sendResponse)
+    .catch((err) => {
+      console.error("[Background] fetchThemeDetails error:", err);
+      sendResponse({ success: false, error: err?.message });
+    });
+  return true;
+}
 
-      case "githubTab":
-        browser.tabs.create({ url: "github.com/BetterSEQTA/BetterSEQTA-Plus" });
-        break;
+function handleFetchFromUrl(request: any, sendResponse: MessageSender): boolean {
+  const { url } = request;
+  if (!url || typeof url !== "string") {
+    sendResponse({ error: "Missing url" });
+    return false;
+  }
+  fetch(url, { cache: "no-store" })
+    .then((r) => r.json())
+    .then((data) => sendResponse({ data }))
+    .catch((err) => {
+      console.error("[Background] fetchFromUrl error:", err);
+      sendResponse({ error: err?.message });
+    });
+  return true;
+}
 
-      case "setDefaultStorage":
-        SetStorageValue(getDefaultValues());
-        break;
+async function parseJsonResponse(r: Response): Promise<any> {
+  const text = await r.text();
+  try {
+    return text ? JSON.parse(text) : {};
+  } catch {
+    return {};
+  }
+}
 
-      case "sendNews":
-        fetchNews(request.source ?? "australia", sendResponse);
-        return true;
+function handleCloudReserveClient(request: any, sendResponse: MessageSender): boolean {
+  const redirect_uri = request.redirect_uri ?? "https://accounts.betterseqta.org/auth/bsplus/callback";
+  fetch("https://accounts.betterseqta.org/api/bsplus/client/reserve", {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ redirect_uri }),
+  })
+    .then(async (r) => {
+      const data = await parseJsonResponse(r);
+      if (!r.ok) sendResponse({ error: data?.error ?? `Reserve failed (${r.status})` });
+      else sendResponse(data);
+    })
+    .catch((err) => {
+      console.error("[Background] cloudReserveClient error:", err);
+      sendResponse({ error: err?.message ?? "Network error" });
+    });
+  return true;
+}
 
-      default:
-        console.log("Unknown request type");
+function handleCloudLogin(request: any, sendResponse: MessageSender): boolean {
+  const { client_id, redirect_uri, login, password } = request;
+  if (!client_id || !redirect_uri || !login || !password) {
+    sendResponse({ error: "Missing client_id, redirect_uri, login, or password" });
+    return false;
+  }
+  fetch("https://accounts.betterseqta.org/api/bsplus/login", {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ client_id, redirect_uri, login, password }),
+  })
+    .then(async (r) => {
+      const data = await parseJsonResponse(r);
+      if (!r.ok) sendResponse({ error: data?.error ?? "Login failed" });
+      else sendResponse(data);
+    })
+    .catch((err) => {
+      console.error("[Background] cloudLogin error:", err);
+      sendResponse({ error: err?.message ?? "Network error" });
+    });
+  return true;
+}
+
+function handleCloudRefresh(request: any, sendResponse: MessageSender): boolean {
+  const { refresh_token, client_id } = request;
+  if (!refresh_token || !client_id) {
+    sendResponse({ error: "Missing refresh_token or client_id" });
+    return false;
+  }
+  fetch("https://accounts.betterseqta.org/api/bsplus/refresh", {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ refresh_token, client_id }),
+  })
+    .then(async (r) => {
+      const data = await parseJsonResponse(r);
+      if (!r.ok) sendResponse({ error: data?.error ?? "Refresh failed" });
+      else sendResponse(data);
+    })
+    .catch((err) => {
+      console.error("[Background] cloudRefresh error:", err);
+      sendResponse({ error: err?.message ?? "Network error" });
+    });
+  return true;
+}
+
+function handleCloudFavorite(request: any, sendResponse: MessageSender): boolean {
+  const { themeId, token, action } = request;
+  if (!themeId || !token) {
+    sendResponse({ success: false, error: "Theme ID and token required" });
+    return false;
+  }
+  const isFavorite = action === "favorite";
+  fetch(`https://betterseqta.org/api/themes/${themeId}/favorite`, {
+    method: isFavorite ? "POST" : "DELETE",
+    headers: { Authorization: `Bearer ${token}` },
+  })
+    .then((r) => r.json())
+    .then(sendResponse)
+    .catch((err) => {
+      console.error("[Background] cloudFavorite error:", err);
+      sendResponse({ success: false, error: err?.message });
+    });
+  return true;
+}
+
+/** Handler for a message type; receives request and sendResponse callback */
+type MessageHandler = { (request: any, sendResponse: MessageSender): boolean | void };
+
+const MESSAGE_HANDLERS: Record<string, MessageHandler> = {
+  reloadTabs: () => reloadSeqtaPages(),
+  extensionPages: (req) => {
+    browser.tabs.query({}).then((tabs) => {
+      for (const tab of tabs) {
+        if (tab.url?.includes("chrome-extension://")) browser.tabs.sendMessage(tab.id!, req);
+      }
+    });
+  },
+  currentTab: (req, sendResponse) => {
+    browser.tabs.query({ active: true, currentWindow: true }).then((tabs) => {
+      browser.tabs.sendMessage(tabs[0].id!, req).then(sendResponse);
+    });
+    return true;
+  },
+  githubTab: () => {
+    void browser.tabs.create({ url: "github.com/BetterSEQTA/BetterSEQTA-Plus" });
+  },
+  setDefaultStorage: () => SetStorageValue(getDefaultValues()),
+  sendNews: (req, sendResponse) => {
+    fetchNews(req.source ?? "australia", sendResponse);
+    return true;
+  },
+  fetchThemes: handleFetchThemes,
+  fetchThemeDetails: handleFetchThemeDetails,
+  fetchFromUrl: handleFetchFromUrl,
+  cloudReserveClient: handleCloudReserveClient,
+  cloudLogin: handleCloudLogin,
+  cloudRefresh: handleCloudRefresh,
+  cloudFavorite: handleCloudFavorite,
+};
+
+browser.runtime.onMessage.addListener(
+  // @ts-ignore - OnMessageListener expects literal true for async, we return boolean
+  (request: any, _: any, sendResponse: MessageSender) => {
+    const handler = MESSAGE_HANDLERS[request.type];
+    if (handler) {
+      const result = handler(request, sendResponse);
+      return result === true;
     }
-
+    console.log("Unknown request type");
     return false;
   },
 );
diff --git a/src/interface/components/SignInToFavoriteModal.svelte b/src/interface/components/SignInToFavoriteModal.svelte
new file mode 100644
index 00000000..24f21e1b
--- /dev/null
+++ b/src/interface/components/SignInToFavoriteModal.svelte
@@ -0,0 +1,77 @@
+<script lang="ts">
+  import { fade } from "svelte/transition";
+  import { animate } from "motion";
+  import { closeExtensionPopup } from "@/seqta/utils/Closers/closeExtensionPopup";
+
+  let { onClose } = $props<{ onClose: () => void }>();
+  let modalElement: HTMLElement;
+
+  $effect(() => {
+    if (modalElement) {
+      animate(modalElement, { scale: [0.9, 1], opacity: [0, 1] }, { type: "spring", stiffness: 300, damping: 25 });
+    }
+  });
+
+  function handleSignIn() {
+    onClose();
+    if (document.getElementById("ExtensionPopup")) {
+      closeExtensionPopup();
+    } else {
+      window.close();
+    }
+  }
+</script>
+
+<div
+  class="flex fixed inset-0 z-[10000] justify-center items-center bg-black/50"
+  onclick={(e) => {
+    if (e.target === e.currentTarget) onClose();
+  }}
+  onkeydown={(e) => {
+    if (e.key === "Escape") onClose();
+  }}
+  role="button"
+  tabindex="-1"
+  transition:fade={{ duration: 150 }}
+>
+  <!-- svelte-ignore a11y_no_static_element_interactions -->
+  <div
+    bind:this={modalElement}
+    class="p-4 mx-4 w-full max-w-md bg-white rounded-2xl shadow-2xl dark:bg-zinc-800 dark:text-white"
+    onclick={(e) => e.stopPropagation()}
+    onkeydown={(e) => e.stopPropagation()}
+  >
+    <h2 class="mb-3 text-xl font-bold text-zinc-900 dark:text-white">
+      Sign in to favorite themes
+    </h2>
+
+    <p class="mb-6 text-zinc-600 dark:text-zinc-400">
+      Sign in in the Theme Store to save favorites across devices, or create an account to get started.
+    </p>
+
+    <div class="flex flex-wrap gap-2 justify-end">
+      <button
+        type="button"
+        onclick={onClose}
+        class="px-4 py-2 text-sm font-medium rounded-lg bg-zinc-200 dark:bg-zinc-700 text-zinc-700 dark:text-zinc-200 hover:bg-zinc-300 dark:hover:bg-zinc-600 transition-colors duration-200"
+      >
+        OK
+      </button>
+      <a
+        href="https://accounts.betterseqta.org/register"
+        target="_blank"
+        rel="noopener noreferrer"
+        class="inline-flex items-center gap-2 px-4 py-2 text-sm font-medium rounded-lg border border-zinc-200 dark:border-zinc-600 text-zinc-700 dark:text-zinc-300 hover:bg-zinc-100 dark:hover:bg-zinc-800 transition-all duration-200"
+      >
+        Create account
+      </a>
+      <button
+        type="button"
+        onclick={handleSignIn}
+        class="px-4 py-2 text-sm font-medium rounded-lg bg-zinc-800 dark:bg-zinc-200 text-white dark:text-zinc-900 hover:bg-zinc-700 dark:hover:bg-zinc-300 transition-colors duration-200"
+      >
+        Sign in
+      </button>
+    </div>
+  </div>
+</div>
diff --git a/src/interface/components/TabbedContainer.svelte b/src/interface/components/TabbedContainer.svelte
index 43a62349..d053f890 100644
--- a/src/interface/components/TabbedContainer.svelte
+++ b/src/interface/components/TabbedContainer.svelte
@@ -3,8 +3,7 @@
   import './TabbedContainer.css';
   import { onMount } from 'svelte';
 
-  let { tabs } = $props<{ tabs: { title: string, Content: any, props?: any }[] }>();
-  let activeTab = $state(0);
+  let { tabs, activeTab = $bindable(0) } = $props<{ tabs: { title: string, Content: any, props?: any }[]; activeTab?: number }>();
   let containerRef: HTMLElement | null = null;
   let tabWidth = $state(0);
 
diff --git a/src/interface/components/store/CloudHeader.svelte b/src/interface/components/store/CloudHeader.svelte
new file mode 100644
index 00000000..7804ec2a
--- /dev/null
+++ b/src/interface/components/store/CloudHeader.svelte
@@ -0,0 +1,203 @@
+<script lang="ts">
+  import { onMount } from "svelte";
+  import { cloudAuth } from "@/seqta/utils/CloudAuth";
+
+  let username = $state("");
+  let password = $state("");
+  let loading = $state(false);
+  let error = $state<string | null>(null);
+  let cloudState = $state(cloudAuth.state);
+  let open = $state(false);
+  let dropdownEl: HTMLElement;
+
+  onMount(() => {
+    const unsubscribe = cloudAuth.subscribe((state) => {
+      cloudState = state;
+    });
+    return unsubscribe;
+  });
+
+  function handleClickOutside(e: MouseEvent) {
+    if (dropdownEl && !dropdownEl.contains(e.target as Node)) {
+      open = false;
+    }
+  }
+
+  $effect(() => {
+    if (open) {
+      const timer = setTimeout(() => {
+        document.addEventListener("click", handleClickOutside);
+      }, 0);
+      return () => {
+        clearTimeout(timer);
+        document.removeEventListener("click", handleClickOutside);
+      };
+    }
+  });
+
+  async function handleLogin() {
+    if (loading) return;
+    error = null;
+    if (!username.trim() || !password) {
+      error = "Please enter username and password";
+      return;
+    }
+    loading = true;
+    try {
+      const result = await cloudAuth.login(username.trim(), password);
+      if (result.success) {
+        password = "";
+        open = false;
+      } else {
+        error = result.error ?? "Login failed";
+      }
+    } finally {
+      loading = false;
+    }
+  }
+
+  async function handleLogout() {
+    await cloudAuth.logout();
+    open = false;
+  }
+
+  function getInitials(): string {
+    const u = cloudState.user;
+    if (!u) return "?";
+    if (u.displayName) return u.displayName.slice(0, 2).toUpperCase();
+    if (u.username) return u.username.slice(0, 2).toUpperCase();
+    if (u.email) return u.email.slice(0, 2).toUpperCase();
+    return "?";
+  }
+</script>
+
+<div class="relative flex items-center" bind:this={dropdownEl}>
+  <button
+    type="button"
+    onclick={() => (open = !open)}
+    class="flex items-center gap-2 px-3 py-2 rounded-lg bg-zinc-100/80 dark:bg-zinc-700/80 hover:bg-zinc-200/80 dark:hover:bg-zinc-600/80 transition-colors duration-200 text-base font-medium text-zinc-900 dark:text-white"
+  >
+    {#if cloudState.isLoggedIn}
+      {#if cloudState.user?.pfpUrl}
+        <img
+          src={cloudState.user.pfpUrl}
+          alt=""
+          class="w-8 h-8 rounded-full object-cover ring-2 ring-zinc-200 dark:ring-zinc-600"
+        />
+      {:else}
+        <div class="flex items-center justify-center w-8 h-8 rounded-full bg-zinc-300 dark:bg-zinc-600 text-zinc-700 dark:text-zinc-200 font-semibold text-sm">
+          {getInitials()}
+        </div>
+      {/if}
+      <span class="hidden max-w-24 truncate sm:inline text-base">
+        {cloudState.user?.displayName || cloudState.user?.username || cloudState.user?.email || "User"}
+      </span>
+    {:else}
+      <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" class="w-5 h-5">
+        <path stroke-linecap="round" stroke-linejoin="round" d="M2.25 15a4.5 4.5 0 004.5 4.5H18a3.75 3.75 0 001.332-7.257 3 3 0 00-3.758-3.848 5.25 5.25 0 00-10.233 2.33A4.502 4.502 0 0012.75 15h-10.5z" />
+      </svg>
+      <span class="text-base font-medium">Sign in</span>
+    {/if}
+  </button>
+
+  {#if open}
+    <!-- svelte-ignore a11y_click_events_have_key_events -->
+    <!-- svelte-ignore a11y_no_static_element_interactions -->
+    <div
+      class="absolute right-0 top-full mt-2 w-80 rounded-xl border border-zinc-200 dark:border-zinc-600 bg-white dark:bg-zinc-800 shadow-xl z-[100] overflow-hidden"
+      onclick={(e) => e.stopPropagation()}
+    >
+      <div class="p-4 border-b border-zinc-200 dark:border-zinc-600">
+        <h3 class="text-xl font-bold text-zinc-900 dark:text-white">BetterSEQTA Cloud</h3>
+        <p class="text-base text-zinc-500 dark:text-zinc-400">Sync favorites across devices</p>
+      </div>
+      <div class="p-4">
+        {#if cloudState.isLoggedIn}
+          <div class="flex flex-col gap-3">
+            <div class="flex items-center gap-3">
+              {#if cloudState.user?.pfpUrl}
+                <img
+                  src={cloudState.user.pfpUrl}
+                  alt=""
+                  class="w-12 h-12 rounded-full object-cover ring-2 ring-zinc-200 dark:ring-zinc-600"
+                />
+              {:else}
+                <div class="flex items-center justify-center w-12 h-12 rounded-full bg-zinc-300 dark:bg-zinc-600 text-zinc-700 dark:text-zinc-200 font-semibold text-base">
+                  {getInitials()}
+                </div>
+              {/if}
+              <div class="min-w-0 flex-1">
+                <p class="text-base font-medium text-zinc-900 dark:text-white truncate">
+                  {cloudState.user?.displayName || cloudState.user?.username || cloudState.user?.email || "User"}
+                </p>
+                {#if cloudState.user?.email && cloudState.user?.email !== (cloudState.user?.displayName || cloudState.user?.username)}
+                  <p class="text-base text-zinc-500 dark:text-zinc-400 truncate">{cloudState.user.email}</p>
+                {/if}
+              </div>
+            </div>
+            <button
+              type="button"
+              onclick={handleLogout}
+              class="w-full px-4 py-3 text-base font-medium rounded-lg bg-zinc-200 dark:bg-zinc-700 text-zinc-900 dark:text-white hover:bg-zinc-300 dark:hover:bg-zinc-600 transition-colors duration-200"
+            >
+              Sign out
+            </button>
+          </div>
+        {:else}
+          <p class="mb-4 text-base text-zinc-600 dark:text-zinc-400">
+            Sign in to favorite themes. Your favorites sync across devices when logged in.
+          </p>
+          <form
+            class="flex flex-col gap-3"
+            autocomplete="off"
+            onsubmit={(e) => {
+              e.preventDefault();
+              handleLogin();
+            }}
+          >
+            <input
+              type="text"
+              name="betterseqta-cloud-username"
+              autocomplete="off"
+              placeholder="Email or username"
+              bind:value={username}
+              disabled={loading}
+              readonly
+              onfocus={(e) => e.currentTarget.removeAttribute('readonly')}
+              class="w-full px-4 py-3 text-base rounded-lg bg-zinc-100 dark:bg-zinc-800 dark:text-white border border-zinc-200 dark:border-zinc-600 focus:outline-none focus:ring-2 focus:ring-accent-ring focus:border-transparent transition-colors duration-200"
+            />
+            <input
+              type="password"
+              name="betterseqta-cloud-password"
+              autocomplete="new-password"
+              placeholder="Password"
+              bind:value={password}
+              disabled={loading}
+              readonly
+              onfocus={(e) => e.currentTarget.removeAttribute('readonly')}
+              class="w-full px-4 py-3 text-base rounded-lg bg-zinc-100 dark:bg-zinc-800 dark:text-white border border-zinc-200 dark:border-zinc-600 focus:outline-none focus:ring-2 focus:ring-accent-ring focus:border-transparent transition-colors duration-200"
+            />
+            {#if error}
+              <p class="text-base text-red-600 dark:text-red-400">{error}</p>
+            {/if}
+            <button
+              type="submit"
+              disabled={loading}
+              class="w-full px-4 py-3 text-base font-medium rounded-lg bg-zinc-800 dark:bg-zinc-200 text-white dark:text-zinc-900 hover:bg-zinc-700 dark:hover:bg-zinc-300 disabled:opacity-50 transition-colors duration-200"
+            >
+              {loading ? "Signing in..." : "Sign in"}
+            </button>
+            <a
+              href="https://accounts.betterseqta.org/register"
+              target="_blank"
+              rel="noopener noreferrer"
+              class="inline-flex items-center justify-center gap-2 px-4 py-3 text-base font-medium rounded-lg border border-zinc-200 dark:border-zinc-600 text-zinc-700 dark:text-zinc-300 hover:bg-zinc-100 dark:hover:bg-zinc-800 transition-all duration-200"
+            >
+              Create account
+            </a>
+          </form>
+        {/if}
+      </div>
+    </div>
+  {/if}
+</div>
diff --git a/src/interface/components/store/CoverSwiper.svelte b/src/interface/components/store/CoverSwiper.svelte
index 981eb4af..d5c35c1a 100644
--- a/src/interface/components/store/CoverSwiper.svelte
+++ b/src/interface/components/store/CoverSwiper.svelte
@@ -29,7 +29,7 @@
 {#if coverThemes.length > 0}
   <div class="relative w-full overflow-clip rounded-xl transition-opacity" transition:fade>
     <div 
-      class="w-full aspect-8/3" 
+      class="w-full aspect-[5/1] max-h-[500px]" 
       use:emblaCarouselSvelte={{ options, plugins }} 
       onemblaInit={onInit}
     >
@@ -42,7 +42,7 @@
             onkeydown={(e) => { if (e.key === 'Enter') setDisplayTheme(theme) }}
             onclick={() => setDisplayTheme(theme)}
           >
-            <img src={theme.marqueeImage} alt="Theme Preview" class="object-cover w-full h-full" />
+            <img src={theme.marqueeImage || theme.coverImage} alt="Theme Preview" class="object-cover w-full h-full" />
             <div class='absolute bottom-0 left-0 p-8 z-[1]'>
               <h2 class='text-4xl font-bold text-white'>{theme.name}</h2>
               <p class='text-lg text-white'>{theme.description}</p>
diff --git a/src/interface/components/store/Header.svelte b/src/interface/components/store/Header.svelte
index 720827af..4ee50781 100644
--- a/src/interface/components/store/Header.svelte
+++ b/src/interface/components/store/Header.svelte
@@ -3,6 +3,7 @@
   import logoDark from '@/resources/icons/betterseqta-light-full.png';
   import { closeStore } from '@/seqta/ui/renderStore'
   import browser from 'webextension-polyfill';
+  import CloudHeader from './CloudHeader.svelte';
 
   // Props
   let { searchTerm, setSearchTerm, darkMode, activeTab, setActiveTab } = $props<{
@@ -39,6 +40,8 @@
       >
         Backgrounds
       </button>
+
+      <CloudHeader />
     </div>
 
     <div class="flex relative gap-2">
diff --git a/src/interface/components/store/ThemeCard.svelte b/src/interface/components/store/ThemeCard.svelte
index 178371eb..7b28a504 100644
--- a/src/interface/components/store/ThemeCard.svelte
+++ b/src/interface/components/store/ThemeCard.svelte
@@ -1,19 +1,110 @@
 <script lang="ts">
   import type { Theme } from '@/interface/types/Theme'
-
-  let { theme, onClick } = $props<{ theme: Theme; onClick: () => void }>();
-
   import { fade } from 'svelte/transition';
+  import { onMount } from 'svelte';
+  import SignInToFavoriteModal from '@/interface/components/SignInToFavoriteModal.svelte';
+
+  let { theme, onClick, toggleFavorite, isLoggedIn } = $props<{
+    theme: Theme;
+    onClick: () => void;
+    toggleFavorite: (theme: Theme) => void;
+    isLoggedIn: boolean;
+  }>();
+  let menuOpen = $state(false);
+  let showSignInModal = $state(false);
+  let menuRef: HTMLDivElement;
+
+  onMount(() => {
+    const closeMenu = (e: MouseEvent) => {
+      if (menuOpen && menuRef && !menuRef.contains(e.target as Node)) {
+        menuOpen = false;
+      }
+    };
+    document.addEventListener('click', closeMenu);
+    return () => document.removeEventListener('click', closeMenu);
+  });
+
+  function handleCardClick(e: MouseEvent) {
+    if ((e.target as HTMLElement).closest('[data-theme-menu]')) return;
+    onClick();
+  }
+
+  function handleFavoriteClick(e: MouseEvent) {
+    e.stopPropagation();
+    if (isLoggedIn) {
+      toggleFavorite(theme);
+    } else {
+      showSignInModal = true;
+    }
+    menuOpen = false;
+  }
 </script>
 
-<div class="w-full cursor-pointer" role="button" tabindex="-1" onkeydown={onClick} onclick={onClick}>
-  <div class="bg-gray-50 w-full transition-all hover:scale-105 duration-500 relative group flex flex-col hover:shadow-2xl dark:hover:shadow-white/[0.1] hover:shadow-white/[0.8] dark:bg-zinc-800 dark:border-white/[0.1] h-auto rounded-xl overflow-clip border" transition:fade>
-    <div class="absolute bottom-1 left-3 z-10 mb-1 text-xl font-bold text-white">
-      {theme.name}
+<div class="w-full cursor-pointer" role="button" tabindex="-1" onkeydown={onClick} onclick={handleCardClick}>
+  <div class="bg-gray-50 w-full transition-all hover:scale-105 duration-500 relative group flex flex-col hover:shadow-2xl dark:hover:shadow-white/[0.1] dark:hover:shadow-white/[0.8] dark:bg-zinc-800 dark:border-white/[0.1] h-auto rounded-xl overflow-clip border" transition:fade>
+    <!-- Menu dropdown -->
+    <div class="absolute top-2 right-2 z-20" data-theme-menu bind:this={menuRef}>
+      <button
+        type="button"
+        class="flex justify-center items-center w-8 h-8 rounded-lg bg-black/40 hover:bg-black/60 text-white transition-all"
+        onclick={(e) => { e.stopPropagation(); menuOpen = !menuOpen; }}
+        aria-label="Theme options"
+      >
+        <svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 24 24" class="w-5 h-5">
+          <path d="M12 8c1.1 0 2-.9 2-2s-.9-2-2-2-2 .9-2 2 .9 2 2 2zm0 2c-1.1 0-2 .9-2 2s.9 2 2 2 2-.9 2-2-.9-2-2-2zm0 6c-1.1 0-2 .9-2 2s.9 2 2 2 2-.9 2-2-.9-2-2-2z"/>
+        </svg>
+      </button>
+      {#if menuOpen}
+        <div
+          class="absolute right-0 top-full mt-1 py-1 min-w-[140px] rounded-lg bg-white dark:bg-zinc-800 shadow-lg border border-zinc-200 dark:border-zinc-700"
+          role="menu"
+        >
+          <button
+            type="button"
+            class="flex gap-2 items-center w-full px-3 py-2 text-left text-sm hover:bg-zinc-100 dark:hover:bg-zinc-700"
+            role="menuitem"
+            onclick={handleFavoriteClick}
+            title={isLoggedIn ? (theme.is_favorited ? 'Remove from favorites' : 'Add to favorites') : 'Sign in to favorite themes'}
+          >
+            <svg
+              xmlns="http://www.w3.org/2000/svg"
+              viewBox="0 0 24 24"
+              fill={theme.is_favorited ? 'currentColor' : 'none'}
+              stroke="currentColor"
+              stroke-width="2"
+              class="w-5 h-5 {theme.is_favorited ? 'text-red-500' : ''}"
+            >
+              <path stroke-linecap="round" stroke-linejoin="round" d="M4.318 6.318a4.5 4.5 0 000 6.364L12 20.364l7.682-7.682a4.5 4.5 0 00-6.364-6.364L12 7.636l-1.318-1.318a4.5 4.5 0 00-6.364 0z" />
+            </svg>
+            {theme.is_favorited ? 'Favorited' : 'Favorite'}
+          </button>
+        </div>
+      {/if}
+    </div>
+    <div class="absolute bottom-1 left-3 right-3 z-10 mb-1 flex flex-col gap-0.5">
+      <span class="text-xl font-bold text-white drop-shadow-md">{theme.name}</span>
+      <div class="flex gap-3 text-xs font-medium text-white/90 drop-shadow-sm">
+        <span class="flex items-center gap-1">
+          <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" class="w-3.5 h-3.5">
+            <path stroke-linecap="round" stroke-linejoin="round" d="M3 16.5v2.25A2.25 2.25 0 005.25 21h13.5A2.25 2.25 0 0021 18.75V16.5M16.5 12L12 16.5m0 0L7.5 12m4.5 4.5V3" />
+          </svg>
+          {(theme.download_count ?? 0).toLocaleString()}
+        </span>
+        <span class="flex items-center gap-1">
+          <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill={theme.is_favorited ? 'currentColor' : 'none'} stroke="currentColor" stroke-width="1.5" class="w-3.5 h-3.5">
+            <path stroke-linecap="round" stroke-linejoin="round" d="M4.318 6.318a4.5 4.5 0 000 6.364L12 20.364l7.682-7.682a4.5 4.5 0 00-6.364-6.364L12 7.636l-1.318-1.318a4.5 4.5 0 00-6.364 0z" />
+          </svg>
+          {(theme.favorite_count ?? 0).toLocaleString()}
+        </span>
+      </div>
     </div>
     <div class='absolute bottom-0 z-0 w-full h-3/4 bg-linear-to-t to-transparent from-black/80'></div>
     <div class='w-full'>
-      <img src={theme.marqueeImage} alt="Theme Preview" class="object-cover w-full h-48 rounded-md" />
+      <img src={theme.marqueeImage || theme.coverImage} alt="Theme Preview" class="object-cover w-full h-48 rounded-md" />
     </div>
   </div>
 </div>
+
+{#if showSignInModal}
+  <SignInToFavoriteModal onClose={() => (showSignInModal = false)} />
+{/if}
diff --git a/src/interface/components/store/ThemeGrid.svelte b/src/interface/components/store/ThemeGrid.svelte
index 6f56120c..b3523f67 100644
--- a/src/interface/components/store/ThemeGrid.svelte
+++ b/src/interface/components/store/ThemeGrid.svelte
@@ -2,7 +2,13 @@
   import type { Theme } from '@/interface/types/Theme'
   import ThemeCard from './ThemeCard.svelte';
 
-  let { themes, searchTerm, setDisplayTheme } = $props<{ themes: Theme[]; searchTerm: string, setDisplayTheme: (theme: Theme) => void }>();
+  let { themes, searchTerm, setDisplayTheme, toggleFavorite, isLoggedIn } = $props<{
+    themes: Theme[];
+    searchTerm: string;
+    setDisplayTheme: (theme: Theme) => void;
+    toggleFavorite: (theme: Theme) => void;
+    isLoggedIn: boolean;
+  }>();
   
   let filteredThemes = $derived(themes.filter((theme: Theme) =>
     theme.name.toLowerCase().includes(searchTerm.toLowerCase()) || theme.description.toLowerCase().includes(searchTerm.toLowerCase())
@@ -12,7 +18,12 @@
 <div class="relative" >
   <div class="grid grid-cols-1 gap-4 py-12 mx-auto sm:grid-cols-2 lg:grid-cols-3">
     {#each filteredThemes as theme (theme.id)}
-      <ThemeCard theme={theme} onClick={() => setDisplayTheme(theme)} />
+      <ThemeCard
+        {theme}
+        onClick={() => setDisplayTheme(theme)}
+        {toggleFavorite}
+        {isLoggedIn}
+      />
     {/each}
   
     {#if filteredThemes.length !== 0}
diff --git a/src/interface/components/store/ThemeModal.svelte b/src/interface/components/store/ThemeModal.svelte
index e7752e70..5deff576 100644
--- a/src/interface/components/store/ThemeModal.svelte
+++ b/src/interface/components/store/ThemeModal.svelte
@@ -2,8 +2,9 @@
   import type { Theme } from '@/interface/types/Theme'
   import { fade } from 'svelte/transition';
   import { animate } from 'motion';
+  import SignInToFavoriteModal from '@/interface/components/SignInToFavoriteModal.svelte';
 
-  let { theme, currentThemes, setDisplayTheme, onInstall, onRemove, allThemes, displayTheme } = $props<{
+  let { theme, currentThemes, setDisplayTheme, onInstall, onRemove, allThemes, displayTheme, toggleFavorite, isLoggedIn } = $props<{
     theme: Theme | null;
     currentThemes: string[];
     setDisplayTheme: (theme: Theme | null) => void;
@@ -11,10 +12,21 @@
     onRemove: (themeId: string) => void;
     allThemes: Theme[];
     displayTheme: Theme | null;
+    toggleFavorite?: (theme: Theme) => void;
+    isLoggedIn?: boolean;
   }>();
   let installing = $state(false);
+  let showSignInModal = $state(false);
   let modalElement: HTMLElement;
 
+  function handleFavoriteClick() {
+    if (isLoggedIn && toggleFavorite && theme) {
+      toggleFavorite(theme);
+    } else {
+      showSignInModal = true;
+    }
+  }
+
   // Function to get related themes
   function getRelatedThemes() {
     return allThemes
@@ -73,35 +85,67 @@
     onkeydown={(e) => e.stopPropagation()}
   >
     <div class="relative h-auto">
-      <button class="absolute top-0 right-0 p-2 text-xl font-bold text-gray-600 font-IconFamily dark:text-gray-200" onclick={() => hideModal()}>
-        {'\ued8a'}
-      </button>
-      <h2 class="mb-4 text-2xl font-bold">
+      <div class="absolute top-0 right-0 flex gap-1 items-center">
+        <button class="p-2 text-xl font-bold text-gray-600 font-IconFamily dark:text-gray-200" onclick={() => hideModal()}>
+          {'\ued8a'}
+        </button>
+      </div>
+      <h2 class="mb-2 text-2xl font-bold">
         {theme.name}
       </h2>
-      <img src={theme.marqueeImage} alt="Theme Cover" class="object-cover mb-4 w-full rounded-md" />
+      <div class="flex gap-4 mb-4 text-sm text-zinc-600 dark:text-zinc-400">
+        <span class="flex items-center gap-1.5">
+          <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" class="w-4 h-4">
+            <path stroke-linecap="round" stroke-linejoin="round" d="M3 16.5v2.25A2.25 2.25 0 005.25 21h13.5A2.25 2.25 0 0021 18.75V16.5M16.5 12L12 16.5m0 0L7.5 12m4.5 4.5V3" />
+          </svg>
+          {(theme.download_count ?? 0).toLocaleString()} downloads
+        </span>
+        <span class="flex items-center gap-1.5">
+          <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill={theme.is_favorited ? 'currentColor' : 'none'} stroke="currentColor" stroke-width="1.5" class="w-4 h-4">
+            <path stroke-linecap="round" stroke-linejoin="round" d="M4.318 6.318a4.5 4.5 0 000 6.364L12 20.364l7.682-7.682a4.5 4.5 0 00-6.364-6.364L12 7.636l-1.318-1.318a4.5 4.5 0 00-6.364 0z" />
+          </svg>
+          {(theme.favorite_count ?? 0).toLocaleString()} favorites
+        </span>
+      </div>
+      <img src={theme.marqueeImage || theme.coverImage} alt="Theme Cover" class="object-cover mb-4 w-full rounded-md" />
       <p class="mb-4 text-gray-700 dark:text-gray-300">
         {theme.description}
       </p>
-      {#if currentThemes.includes(theme.id)}
-        <button onclick={async () => {installing = true; await onRemove(theme.id); installing = false}} class="flex relative justify-center items-center px-4 py-2 mt-4 ml-auto w-32 text-black rounded-full dark:text-white bg-zinc-300 dark:bg-zinc-700 dark:hover:bg-zinc-600/50 hover:bg-zinc-200">
-          {#if installing}
-            <svg class="absolute w-4 h-4 { installing ? 'opacity-100' : 'opacity-0' }" width="24" height="24" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
-              <path stroke="currentColor" fill="currentColor" class="origin-center animate-spin-fast" d="M2,12A11.2,11.2,0,0,1,13,1.05C12.67,1,12.34,1,12,1a11,11,0,0,0,0,22c.34,0,.67,0,1-.05C6,23,2,17.74,2,12Z"/>
+      <div class="flex flex-wrap gap-2 mt-4 justify-end items-center">
+        {#if toggleFavorite && theme}
+          <button
+            type="button"
+            class="flex items-center gap-2 px-4 py-2 rounded-full transition-all duration-200 hover:scale-105 active:scale-95 {theme.is_favorited ? 'text-red-500 bg-red-500/10 dark:bg-red-500/20' : 'bg-zinc-200 dark:bg-zinc-700 dark:text-white hover:bg-zinc-300 dark:hover:bg-zinc-600'}"
+            onclick={handleFavoriteClick}
+            title={isLoggedIn ? (theme.is_favorited ? 'Remove from favorites' : 'Add to favorites') : 'Sign in to favorite themes'}
+            aria-label={theme.is_favorited ? 'Unfavorite' : 'Favorite'}
+          >
+            <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill={theme.is_favorited ? 'currentColor' : 'none'} stroke="currentColor" stroke-width="2" class="w-5 h-5">
+              <path stroke-linecap="round" stroke-linejoin="round" d="M4.318 6.318a4.5 4.5 0 000 6.364L12 20.364l7.682-7.682a4.5 4.5 0 00-6.364-6.364L12 7.636l-1.318-1.318a4.5 4.5 0 00-6.364 0z" />
             </svg>
-          {/if}
-          <span class="{ installing ? 'opacity-0' : 'opacity-100' }">Remove</span>
-        </button>
-      {:else}
-        <button onclick={async () => {installing = true; await onInstall(theme.id); installing = false}} class="flex relative justify-center items-center px-4 py-2 mt-4 ml-auto w-32 text-black rounded-full dark:text-white bg-zinc-300 dark:bg-zinc-700 dark:hover:bg-zinc-600/50 hover:bg-zinc-200">
-          {#if installing}
-            <svg class="absolute w-4 h-4 { installing ? 'opacity-100' : 'opacity-0' }" width="24" height="24" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
-              <path stroke="currentColor" fill="currentColor" class="origin-center animate-spin-fast" d="M2,12A11.2,11.2,0,0,1,13,1.05C12.67,1,12.34,1,12,1a11,11,0,0,0,0,22c.34,0,.67,0,1-.05C6,23,2,17.74,2,12Z"/>
-            </svg>
-          {/if}
-          <span class="{ installing ? 'opacity-0' : 'opacity-100' }">Install</span>
-        </button>
-      {/if}
+            {theme.is_favorited ? 'Favorited' : 'Favorite'}
+          </button>
+        {/if}
+        {#if currentThemes.includes(theme.id)}
+          <button onclick={async () => {installing = true; await onRemove(theme.id); installing = false}} class="flex relative justify-center items-center px-4 py-2 w-32 text-black rounded-full dark:text-white bg-zinc-300 dark:bg-zinc-700 dark:hover:bg-zinc-600/50 hover:bg-zinc-200 transition-all duration-200 hover:scale-105 active:scale-95">
+            {#if installing}
+              <svg class="absolute w-4 h-4 { installing ? 'opacity-100' : 'opacity-0' }" width="24" height="24" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
+                <path stroke="currentColor" fill="currentColor" class="origin-center animate-spin-fast" d="M2,12A11.2,11.2,0,0,1,13,1.05C12.67,1,12.34,1,12,1a11,11,0,0,0,0,22c.34,0,.67,0,1-.05C6,23,2,17.74,2,12Z"/>
+              </svg>
+            {/if}
+            <span class="{ installing ? 'opacity-0' : 'opacity-100' }">Remove</span>
+          </button>
+        {:else}
+          <button onclick={async () => {installing = true; await onInstall(theme.id); installing = false}} class="flex relative justify-center items-center px-4 py-2 w-32 text-black rounded-full dark:text-white bg-zinc-300 dark:bg-zinc-700 dark:hover:bg-zinc-600/50 hover:bg-zinc-200 transition-all duration-200 hover:scale-105 active:scale-95">
+            {#if installing}
+              <svg class="absolute w-4 h-4 { installing ? 'opacity-100' : 'opacity-0' }" width="24" height="24" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
+                <path stroke="currentColor" fill="currentColor" class="origin-center animate-spin-fast" d="M2,12A11.2,11.2,0,0,1,13,1.05C12.67,1,12.34,1,12,1a11,11,0,0,0,0,22c.34,0,.67,0,1-.05C6,23,2,17.74,2,12Z"/>
+              </svg>
+            {/if}
+            <span class="{ installing ? 'opacity-0' : 'opacity-100' }">Install</span>
+          </button>
+        {/if}
+      </div>
 
       <div class="my-8 border-b border-zinc-200 dark:border-zinc-700"></div>
 
@@ -116,7 +160,7 @@
                 {relatedTheme.name}
               </div>
               <div class="absolute bottom-0 z-0 w-full h-3/4 to-transparent from-black/80 bg-linear-to-t"></div>
-              <img src={relatedTheme.marqueeImage} alt="Theme Preview" class="object-cover w-full h-48" />
+              <img src={relatedTheme.marqueeImage || relatedTheme.coverImage} alt="Theme Preview" class="object-cover w-full h-48" />
             </div>
           </button>
         {/each}
@@ -124,3 +168,7 @@
     </div>
   </div>
 </div>
+
+{#if showSignInModal}
+  <SignInToFavoriteModal onClose={() => (showSignInModal = false)} />
+{/if}
diff --git a/src/interface/components/themes/ThemeSelector.svelte b/src/interface/components/themes/ThemeSelector.svelte
index e8606c6f..80be9e8d 100644
--- a/src/interface/components/themes/ThemeSelector.svelte
+++ b/src/interface/components/themes/ThemeSelector.svelte
@@ -1,11 +1,14 @@
 <script lang="ts">
   import type { CustomTheme, ThemeList } from '@/types/CustomThemes'
   import { onDestroy, onMount } from 'svelte'
+  import browser from 'webextension-polyfill'
   import { OpenThemeCreator } from '@/plugins/built-in/themes/ThemeCreator'
   import { OpenStorePage } from '@/seqta/ui/renderStore'
   import { themeUpdates } from '@/interface/hooks/ThemeUpdates'
   import { closeExtensionPopup } from '@/seqta/utils/Closers/closeExtensionPopup'
   import { ThemeManager } from '@/plugins/built-in/themes/theme-manager'
+  import { cloudAuth } from '@/seqta/utils/CloudAuth'
+  import SignInToFavoriteModal from '@/interface/components/SignInToFavoriteModal.svelte'
 
   const themeManager = ThemeManager.getInstance();
 
@@ -13,6 +16,17 @@
   let { isEditMode } = $props<{ isEditMode: boolean }>();
   let isDragging = $state(false);
   let tempTheme = $state(null);
+  let favoriteStatus = $state<Record<string, boolean>>({});
+  let cloudLoggedIn = $state(cloudAuth.state.isLoggedIn);
+  let prevLoggedIn = $state(false);
+  let showSignInModal = $state(false);
+
+  cloudAuth.subscribe((s) => {
+    const now = s.isLoggedIn;
+    if (now && !prevLoggedIn && themes) void fetchThemes();
+    prevLoggedIn = now;
+    cloudLoggedIn = now;
+  });
 
   const handleThemeClick = async (theme: CustomTheme, e: MouseEvent) => {
     if (isEditMode) return;
@@ -87,11 +101,55 @@
       themes: await themeManager.getAvailableThemes(),
       selectedTheme: themeManager.getSelectedThemeId() || '',
     }
+    if (themes && cloudLoggedIn) {
+      const token = await cloudAuth.getStoredToken();
+      if (token) {
+        const status: Record<string, boolean> = {};
+        await Promise.all(
+          themes.themes.map(async (t) => {
+            try {
+              const res = (await browser.runtime.sendMessage({
+                type: 'fetchThemeDetails',
+                themeId: t.id,
+                token,
+              })) as { success?: boolean; data?: { theme?: { is_favorited?: boolean } } };
+              if (res?.success && res?.data?.theme) {
+                status[t.id] = !!res.data.theme.is_favorited;
+              }
+            } catch {
+              // Theme may not exist on store (e.g. locally created)
+            }
+          })
+        );
+        favoriteStatus = status;
+      }
+    } else {
+      favoriteStatus = {};
+    }
+  }
+
+  const handleToggleFavorite = async (theme: CustomTheme, e: MouseEvent) => {
+    e.stopPropagation();
+    if (!cloudLoggedIn) {
+      showSignInModal = true;
+      return;
+    }
+    const token = await cloudAuth.getStoredToken();
+    if (!token) return;
+    const isFavorite = !favoriteStatus[theme.id];
+    const result = (await browser.runtime.sendMessage({
+      type: 'cloudFavorite',
+      themeId: theme.id,
+      token,
+      action: isFavorite ? 'favorite' : 'unfavorite',
+    })) as { success?: boolean };
+    if (result?.success) {
+      favoriteStatus = { ...favoriteStatus, [theme.id]: isFavorite };
+    }
   }
 
   onMount(async () => {
     await fetchThemes();
-
     themeUpdates.addListener(fetchThemes);
   })
 
@@ -144,6 +202,18 @@
           {/if}
 
           {#if !isEditMode}
+            <div
+              class="flex absolute right-24 top-1/4 z-20 place-items-center p-2 w-8 h-8 text-center rounded-full opacity-0 transition-all -translate-y-1/2 group-hover:opacity-100 group-hover:top-1/2 {(favoriteStatus[theme.id] ?? false) ? 'text-red-400' : 'text-white/80'} bg-black/50"
+              onclick={(event) => handleToggleFavorite(theme, event)}
+              onkeydown={(event) => { if (event.key === 'Enter' || event.key === ' ') handleToggleFavorite(theme, event as any) }}
+              role="button"
+              tabindex="-1"
+              title={cloudLoggedIn ? ((favoriteStatus[theme.id] ?? false) ? 'Remove from favorites' : 'Add to favorites') : 'Sign in to favorite themes'}
+            >
+              <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill={(favoriteStatus[theme.id] ?? false) ? 'currentColor' : 'none'} stroke="currentColor" stroke-width="2" class="w-5 h-5">
+                <path stroke-linecap="round" stroke-linejoin="round" d="M4.318 6.318a4.5 4.5 0 000 6.364L12 20.364l7.682-7.682a4.5 4.5 0 00-6.364-6.364L12 7.636l-1.318-1.318a4.5 4.5 0 00-6.364 0z" />
+              </svg>
+            </div>
             <div
               class="absolute z-20 flex w-8 h-8 p-2 text-white transition-all rounded-full delay-[20ms] opacity-0 top-1/4 right-2 bg-black/50 place-items-center group-hover:opacity-100 group-hover:top-1/2 -translate-y-1/2"
               onclick={(event) => { event.stopPropagation(); OpenThemeCreator(theme.id); closeExtensionPopup() }}
@@ -211,3 +281,7 @@
     </button>
   </div>
 </div>
+
+{#if showSignInModal}
+  <SignInToFavoriteModal onClose={() => (showSignInModal = false)} />
+{/if}
diff --git a/src/interface/pages/settings.svelte b/src/interface/pages/settings.svelte
index 3ecdad60..53c00412 100644
--- a/src/interface/pages/settings.svelte
+++ b/src/interface/pages/settings.svelte
@@ -19,6 +19,7 @@
   import { settingsPopup } from "../hooks/SettingsPopup";
 
   let devModeSequence = "";
+  let settingsActiveTab = $state(0);
   let showDisclaimerModal = $state(false);
   let disclaimerCallbacks = $state<{ onConfirm: () => void, onCancel: () => void } | null>(null);
 
@@ -71,13 +72,14 @@
     showDisclaimerModal = true;
   };
 
-  onMount(async () => {
+  onMount(() => {
     settingsPopup.addListener(() => {
       showColourPicker = false;
     });
 
-    if (!standalone) return;
-    StandaloneStore.setStandalone(true);
+    if (standalone) {
+      StandaloneStore.setStandalone(true);
+    }
   });
 </script>
 
@@ -275,6 +277,7 @@
     </div>
 
     <TabbedContainer
+      bind:activeTab={settingsActiveTab}
       tabs={[
         {
           title: "Settings",
diff --git a/src/interface/pages/store.svelte b/src/interface/pages/store.svelte
index f3387af0..67de3f78 100644
--- a/src/interface/pages/store.svelte
+++ b/src/interface/pages/store.svelte
@@ -15,8 +15,12 @@
 
   import { loadBackground } from '@/seqta/ui/ImageBackgrounds'
   import Backgrounds from '../components/store/Backgrounds.svelte'
+  import { cloudAuth } from '@/seqta/utils/CloudAuth'
 
   const themeManager = ThemeManager.getInstance();
+  let cloudLoggedIn = $state(cloudAuth.state.isLoggedIn);
+
+  cloudAuth.subscribe((s) => { cloudLoggedIn = s.isLoggedIn; });
 
   // State variables
   let searchTerm = $state('');
@@ -48,20 +52,57 @@
     activeTab = tab;
   };
 
-  // Fetch themes and initialize app
+  const toggleFavorite = async (theme: Theme) => {
+    const token = await cloudAuth.getStoredToken();
+    if (!token) return;
+    const isFavorite = !theme.is_favorited;
+    const result = (await browser.runtime.sendMessage({
+      type: 'cloudFavorite',
+      themeId: theme.id,
+      token,
+      action: isFavorite ? 'favorite' : 'unfavorite',
+    })) as { success?: boolean };
+    if (result?.success) {
+      const delta = isFavorite ? 1 : -1;
+      themes = themes.map((t) =>
+        t.id === theme.id
+          ? { ...t, is_favorited: isFavorite, favorite_count: Math.max(0, (t.favorite_count ?? 0) + delta) }
+          : t
+      );
+      if (displayTheme?.id === theme.id) {
+        displayTheme = {
+          ...displayTheme,
+          is_favorited: isFavorite,
+          favorite_count: Math.max(0, (displayTheme.favorite_count ?? 0) + delta),
+        };
+      }
+    }
+  };
+
+  // Fetch themes via background script (avoids CORS when store runs inside SEQTA page)
   const fetchThemes = async () => {
     try {
-      const response = await fetch(`https://raw.githubusercontent.com/BetterSEQTA/BetterSEQTA-Themes/main/store/themes.json?nocache=${(new Date()).getTime()}`, { cache: 'no-store' });
-      const data = await response.json();
-      themes = data.themes;
+      const token = await cloudAuth.getStoredToken();
+      const data = (await browser.runtime.sendMessage({
+        type: 'fetchThemes',
+        token: token ?? undefined,
+      })) as {
+        success?: boolean;
+        data?: { themes: Theme[] };
+        error?: string;
+      };
+      if (!data?.success || !data?.data?.themes) {
+        throw new Error(data?.error || 'Failed to fetch themes');
+      }
+      themes = data.data.themes;
 
       // Shuffle for cover themes
       const shuffled = [...themes].sort(() => 0.5 - Math.random());
       coverThemes = shuffled.slice(0, 3);
 
       loading = false;
-    } catch (error) {
-      console.error('Failed to fetch themes', error);
+    } catch (err) {
+      console.error('Failed to fetch themes', err);
       setTimeout(fetchThemes, 5000); // Retry after 5 seconds if failure occurs
     }
   };
@@ -91,6 +132,17 @@
       console.error(error);
     }
   });
+
+  // Refetch themes when user logs in (from another tab) to get is_favorited
+  let lastLoggedIn = $state(false);
+  $effect(() => {
+    if (cloudLoggedIn && !lastLoggedIn) {
+      lastLoggedIn = true;
+      fetchThemes();
+    } else if (!cloudLoggedIn) {
+      lastLoggedIn = false;
+    }
+  });
 </script>
 
 <div class="w-screen h-screen bg-white {darkMode ? 'dark' : ''}">
@@ -111,7 +163,13 @@
           {/if}
     
           <!-- ThemeGrid to display filtered themes -->
-          <ThemeGrid themes={filteredThemes} {searchTerm} {setDisplayTheme} />
+          <ThemeGrid
+            themes={filteredThemes}
+            {searchTerm}
+            {setDisplayTheme}
+            {toggleFavorite}
+            isLoggedIn={cloudLoggedIn}
+          />
     
           {#if displayTheme}
             <ThemeModal
@@ -120,6 +178,8 @@
               theme={displayTheme}
               {displayTheme}
               {setDisplayTheme}
+              {toggleFavorite}
+              isLoggedIn={cloudLoggedIn}
               onInstall={async () => {
                 if (displayTheme) {
                   await themeManager.downloadTheme(displayTheme);
diff --git a/src/interface/types/Theme.ts b/src/interface/types/Theme.ts
index b68a5ba1..28fb7918 100644
--- a/src/interface/types/Theme.ts
+++ b/src/interface/types/Theme.ts
@@ -1,7 +1,11 @@
 export type Theme = {
+  id: string;
   name: string;
   description: string;
   coverImage: string;
-  marqueeImage: string;
-  id: string;
+  marqueeImage?: string;
+  theme_json_url?: string;
+  is_favorited?: boolean;
+  favorite_count?: number;
+  download_count?: number;
 };
diff --git a/src/manifests/manifest.json b/src/manifests/manifest.json
index 92736dce..40091d86 100644
--- a/src/manifests/manifest.json
+++ b/src/manifests/manifest.json
@@ -16,12 +16,12 @@
     }
   },
   "permissions": ["tabs", "notifications", "storage"],
-  "host_permissions": ["https://newsapi.org/", "*://*/*"],
+  "host_permissions": ["https://newsapi.org/", "https://betterseqta.org/", "https://accounts.betterseqta.org/", "*://*/*"],
   "background": {
     "service_worker": "background.ts"
   },
   "content_security_policy": {
-    "extension_pages": "script-src 'self'; object-src 'self'"
+    "extension_pages": "script-src 'self'; object-src 'self'; connect-src 'self' https://betterseqta.org https://accounts.betterseqta.org https://raw.githubusercontent.com"
   },
   "content_scripts": [
     {
diff --git a/src/plugins/built-in/themes/theme-manager.ts b/src/plugins/built-in/themes/theme-manager.ts
index 69e6ff23..488e376b 100644
--- a/src/plugins/built-in/themes/theme-manager.ts
+++ b/src/plugins/built-in/themes/theme-manager.ts
@@ -1,4 +1,5 @@
 import localforage from "localforage";
+import browser from "webextension-polyfill";
 import type { CustomTheme, LoadedCustomTheme } from "@/types/CustomThemes";
 import { settingsState } from "@/seqta/utils/listeners/SettingsState";
 import debounce from "@/seqta/utils/debounce";
@@ -470,23 +471,53 @@ export class ThemeManager {
     }
   }
 
+  private readonly THEME_API_BASE = 'https://betterseqta.org/api';
+  private readonly GITHUB_THEMES_BASE = 'https://raw.githubusercontent.com/BetterSEQTA/BetterSEQTA-Themes/main/store/themes';
+
   /**
-   * Download and install a theme from the store
+   * Fetch JSON from a URL via background script (avoids CORS when running inside SEQTA page)
+   */
+  private async fetchFromUrl(url: string): Promise<any> {
+    const result = (await browser.runtime.sendMessage({
+      type: 'fetchFromUrl',
+      url,
+    })) as { data?: unknown; error?: string };
+    if (result?.error) throw new Error(result.error);
+    return result?.data;
+  }
+
+  /**
+   * Download and install a theme from the store.
+   * Uses API first (increments download_count), falls back to GitHub if unreachable.
    */
   public async downloadTheme(themeContent: {
     id: string;
     name: string;
-    description: string;
-    coverImage: string;
+    description?: string;
+    coverImage?: string;
+    theme_json_url?: string;
   }): Promise<void> {
     console.debug("[ThemeManager] Downloading theme:", themeContent.name);
     try {
       if (!themeContent.id) return;
 
-      const response = await fetch(
-        `https://raw.githubusercontent.com/BetterSEQTA/BetterSEQTA-Themes/main/store/themes/${themeContent.id}/theme.json`,
-      );
-      const themeData = (await response.json()) as ThemeContent;
+      let themeData: ThemeContent;
+
+      try {
+        // Try API first (increments download_count)
+        const downloadData = (await this.fetchFromUrl(
+          `${this.THEME_API_BASE}/themes/${themeContent.id}/download`
+        )) as { success?: boolean; data?: { theme_json_url: string } };
+        if (!downloadData?.success || !downloadData?.data?.theme_json_url) {
+          throw new Error("Failed to get theme download URL");
+        }
+        themeData = (await this.fetchFromUrl(downloadData.data.theme_json_url)) as ThemeContent;
+      } catch (apiError) {
+        // Fallback to GitHub if API is unreachable
+        console.warn("[ThemeManager] API failed, trying GitHub fallback:", apiError);
+        const githubUrl = `${this.GITHUB_THEMES_BASE}/${themeContent.id}/theme.json`;
+        themeData = (await this.fetchFromUrl(githubUrl)) as ThemeContent;
+      }
 
       await this.installTheme(themeData);
     } catch (error) {
diff --git a/src/seqta/utils/CloudAuth.ts b/src/seqta/utils/CloudAuth.ts
new file mode 100644
index 00000000..ff4f15f8
--- /dev/null
+++ b/src/seqta/utils/CloudAuth.ts
@@ -0,0 +1,199 @@
+import browser from "webextension-polyfill";
+import { settingsState } from "@/seqta/utils/listeners/SettingsState";
+
+const REDIRECT_URI = "https://accounts.betterseqta.org/auth/bsplus/callback";
+
+const STORAGE_KEYS = {
+  clientId: "bsplus_client_id",
+  accessToken: "bsplus_token",
+  refreshToken: "bsplus_refresh_token",
+  user: "bsplus_user",
+} as const;
+
+export type CloudUser = {
+  id: string;
+  email?: string;
+  username?: string;
+  displayName?: string;
+  pfpUrl?: string;
+  admin_level?: number;
+};
+
+export type CloudAuthState = {
+  isLoggedIn: boolean;
+  user: CloudUser | null;
+};
+
+/** Callback invoked when auth state changes */
+type Listener = { (state: CloudAuthState): void };
+
+class CloudAuthService {
+  private static instance: CloudAuthService;
+  private listeners = new Set<Listener>();
+  private _state: CloudAuthState = { isLoggedIn: false, user: null };
+
+  private constructor() {
+    void this.loadFromStorage();
+    browser.storage.onChanged.addListener((changes, areaName) => {
+      if (
+        areaName === "local" &&
+        (changes[STORAGE_KEYS.accessToken] ||
+          changes[STORAGE_KEYS.user] ||
+          changes[STORAGE_KEYS.clientId])
+      ) {
+        void this.loadFromStorage();
+      }
+    });
+  }
+
+  public static getInstance(): CloudAuthService {
+    if (!CloudAuthService.instance) {
+      CloudAuthService.instance = new CloudAuthService();
+    }
+    return CloudAuthService.instance;
+  }
+
+  public get state(): CloudAuthState {
+    return this._state;
+  }
+
+  public subscribe(listener: Listener): () => void {
+    this.listeners.add(listener);
+    listener(this._state);
+    return () => this.listeners.delete(listener);
+  }
+
+  private async loadFromStorage(): Promise<void> {
+    const result = await browser.storage.local.get([
+      STORAGE_KEYS.accessToken,
+      STORAGE_KEYS.user,
+    ]);
+    const token = result[STORAGE_KEYS.accessToken] as string | undefined;
+    const user = result[STORAGE_KEYS.user] as CloudUser | undefined;
+    this._state = {
+      isLoggedIn: !!token,
+      user: user ?? null,
+    };
+    this.notify();
+  }
+
+  private notify(): void {
+    for (const listener of this.listeners) {
+      listener(this._state);
+    }
+  }
+
+  public async getStoredToken(): Promise<string | null> {
+    const result = await browser.storage.local.get(STORAGE_KEYS.accessToken);
+    return (result[STORAGE_KEYS.accessToken] as string) ?? null;
+  }
+
+  private async getClientId(): Promise<string> {
+    let clientId = (settingsState as any)[STORAGE_KEYS.clientId] as string | undefined;
+    if (!clientId) {
+      const stored = await browser.storage.local.get(STORAGE_KEYS.clientId);
+      clientId = stored[STORAGE_KEYS.clientId] as string | undefined;
+    }
+    if (!clientId) {
+      const reserveResult = (await browser.runtime.sendMessage({
+        type: "cloudReserveClient",
+        redirect_uri: REDIRECT_URI,
+      })) as { client_id?: string; error?: string };
+      if (!reserveResult?.client_id) {
+        throw new Error(reserveResult?.error ?? "Failed to reserve client");
+      }
+      clientId = reserveResult.client_id;
+      (settingsState as any).setKey(STORAGE_KEYS.clientId, clientId);
+    }
+    return clientId;
+  }
+
+  public async login(
+    login: string,
+    password: string
+  ): Promise<{ success: boolean; error?: string }> {
+    try {
+      const clientId = await this.getClientId();
+      const result = (await browser.runtime.sendMessage({
+        type: "cloudLogin",
+        client_id: clientId,
+        redirect_uri: REDIRECT_URI,
+        login: login.trim(),
+        password,
+      })) as {
+        access_token?: string;
+        refresh_token?: string;
+        user?: CloudUser;
+        error?: string;
+      };
+      if (result?.access_token && result?.refresh_token) {
+        (settingsState as any).setKey(STORAGE_KEYS.accessToken, result.access_token);
+        (settingsState as any).setKey(STORAGE_KEYS.refreshToken, result.refresh_token);
+        (settingsState as any).setKey(STORAGE_KEYS.user, result.user ?? null);
+        this._state = {
+          isLoggedIn: true,
+          user: result.user ?? null,
+        };
+        this.notify();
+        return { success: true };
+      }
+      return {
+        success: false,
+        error: result?.error ?? "Login failed",
+      };
+    } catch (err) {
+      return {
+        success: false,
+        error: err instanceof Error ? err.message : "Login failed",
+      };
+    }
+  }
+
+  public async logout(): Promise<void> {
+    await browser.storage.local.remove([
+      STORAGE_KEYS.accessToken,
+      STORAGE_KEYS.refreshToken,
+      STORAGE_KEYS.user,
+      "cloudAccessToken",
+      "cloudUsername",
+    ]);
+    this._state = { isLoggedIn: false, user: null };
+    this.notify();
+  }
+
+  public async refreshToken(): Promise<boolean> {
+    const result = await browser.storage.local.get([
+      STORAGE_KEYS.refreshToken,
+      STORAGE_KEYS.clientId,
+    ]);
+    const refreshToken = result[STORAGE_KEYS.refreshToken] as string | undefined;
+    const clientId = result[STORAGE_KEYS.clientId] as string | undefined;
+    if (!refreshToken || !clientId) return false;
+
+    const refreshResult = (await browser.runtime.sendMessage({
+      type: "cloudRefresh",
+      refresh_token: refreshToken,
+      client_id: clientId,
+    })) as {
+      access_token?: string;
+      refresh_token?: string;
+      user?: CloudUser;
+      error?: string;
+    };
+
+    if (refreshResult?.access_token && refreshResult?.refresh_token) {
+      (settingsState as any).setKey(STORAGE_KEYS.accessToken, refreshResult.access_token);
+      (settingsState as any).setKey(STORAGE_KEYS.refreshToken, refreshResult.refresh_token);
+      (settingsState as any).setKey(STORAGE_KEYS.user, refreshResult.user ?? null);
+      this._state = {
+        isLoggedIn: true,
+        user: refreshResult.user ?? null,
+      };
+      this.notify();
+      return true;
+    }
+    return false;
+  }
+}
+
+export const cloudAuth = CloudAuthService.getInstance();
diff --git a/src/types/storage.ts b/src/types/storage.ts
index d25cc192..92ee9e5f 100644
--- a/src/types/storage.ts
+++ b/src/types/storage.ts
@@ -47,6 +47,12 @@ export interface SettingsState {
   lettergrade: boolean;
   assessmentsAverage?: boolean;
   notificationCollector?: boolean;
+
+  // BetterSEQTA Cloud (accounts.betterseqta.org)
+  bsplus_client_id?: string;
+  bsplus_token?: string;
+  bsplus_refresh_token?: string;
+  bsplus_user?: { id: string; email?: string; username?: string; displayName?: string; pfpUrl?: string; admin_level?: number };
 }
 
 interface ToggleItem {