diff --git a/README.md b/README.md
index a58a799..87a3565 100644
--- a/README.md
+++ b/README.md
@@ -24,8 +24,9 @@ with JSON indicating whether the message meets a specified criterion.
 - **Rule enable/disable** – temporarily turn a rule off without removing it.
 - **Account & folder filters** – limit rules to specific accounts or folders.
 - **Context menu** – apply AI rules from the message list or the message display action button.
-- **Status icons** – toolbar icons show when classification is in progress and briefly display success states. If a failure occurs the icon turns red until you dismiss the notification.
-- **Error notification** – failed classification displays a notification with a button to clear the error and reset the icon.
+- **Status icons** – toolbar icons show when classification is in progress and briefly display success states. If a failure occurs the icon turns red briefly before returning to normal.
+- **Error notification** – failed classification displays a notification in Thunderbird.
+- **Session error log** – the Errors tab (visible only when errors occur) shows errors recorded since the last add-on start.
 - **View reasoning** – inspect why rules matched via the Details popup.
 - **Cache management** – clear cached results from the context menu or options page.
 - **Queue & timing stats** – monitor processing time on the Maintenance tab.
@@ -88,7 +89,7 @@ Sortana is implemented entirely with standard WebExtension scripts—no custom e
    open a compose window using the account that received the message.
 3. Save your settings. New mail will be evaluated automatically using the
    configured rules.
-4. If the toolbar icon shows a red X, click the notification's **Dismiss** button to clear the error.
+4. If the toolbar icon shows a red X, it will clear after a few seconds. Open the Errors tab in Options to review the latest failures.
 
 ### Example Filters
 
diff --git a/background.js b/background.js
index fc585ff..e16d5a3 100644
--- a/background.js
+++ b/background.js
@@ -19,6 +19,7 @@ let queue = Promise.resolve();
 let queuedCount = 0;
 let processing = false;
 let iconTimer = null;
+let errorTimer = null;
 let timingStats = { count: 0, mean: 0, m2: 0, total: 0, last: -1 };
 let currentStart = 0;
 let logGetTiming = true;
@@ -33,8 +34,11 @@ let userTheme = 'auto';
 let currentTheme = 'light';
 let detectSystemTheme;
 let errorPending = false;
+let errorLog = [];
 let showDebugTab = false;
 const ERROR_NOTIFICATION_ID = 'sortana-error';
+const ERROR_ICON_TIMEOUT = 4500;
+const MAX_ERROR_LOG = 50;
 
 function normalizeRules(rules) {
     return Array.isArray(rules) ? rules.map(r => {
@@ -108,11 +112,33 @@ function showTransientIcon(factory, delay = 1500) {
 
 async function clearError() {
     errorPending = false;
-    await storage.local.set({ errorPending: false });
+    clearTimeout(errorTimer);
     await browser.notifications.clear(ERROR_NOTIFICATION_ID);
     updateActionIcon();
 }
 
+function recordError(context, err) {
+    const message = err instanceof Error ? err.message : String(err || 'Unknown error');
+    const detail = err instanceof Error ? err.stack : '';
+    errorLog.unshift({
+        time: Date.now(),
+        context,
+        message,
+        detail
+    });
+    if (errorLog.length > MAX_ERROR_LOG) {
+        errorLog.length = MAX_ERROR_LOG;
+    }
+    errorPending = true;
+    updateActionIcon();
+    clearTimeout(errorTimer);
+    errorTimer = setTimeout(() => {
+        errorPending = false;
+        updateActionIcon();
+    }, ERROR_ICON_TIMEOUT);
+    browser.runtime.sendMessage({ type: 'sortana:errorLogUpdated', count: errorLog.length }).catch(() => {});
+}
+
 function refreshMenuIcons() {
     browser.menus.update('apply-ai-rules-list', { icons: iconPaths('eye') });
     browser.menus.update('apply-ai-rules-display', { icons: iconPaths('eye') });
@@ -382,16 +408,14 @@ async function processMessage(id) {
         const elapsed = Date.now() - currentStart;
         currentStart = 0;
         updateTimingStats(elapsed);
-        await storage.local.set({ classifyStats: timingStats, errorPending: true });
-        errorPending = true;
+        await storage.local.set({ classifyStats: timingStats });
         logger.aiLog("failed to apply AI rules", { level: 'error' }, e);
-        setIcon(ICONS.error());
+        recordError("Failed to apply AI rules", e);
         browser.notifications.create(ERROR_NOTIFICATION_ID, {
             type: 'basic',
             iconUrl: browser.runtime.getURL('resources/img/logo.png'),
             title: 'Sortana Error',
-            message: 'Failed to apply AI rules',
-            buttons: [{ title: 'Dismiss' }]
+            message: 'Failed to apply AI rules'
         });
     }
 }
@@ -451,7 +475,7 @@ async function clearCacheForMessages(idsInput) {
     }
 
     try {
-        const store = await storage.local.get(["endpoint", "templateName", "customTemplate", "customSystemPrompt", "aiParams", "debugLogging", "htmlToMarkdown", "stripUrlParams", "altTextImages", "collapseWhitespace", "tokenReduction", "aiRules", "theme", "errorPending", "showDebugTab"]);
+        const store = await storage.local.get(["endpoint", "templateName", "customTemplate", "customSystemPrompt", "aiParams", "debugLogging", "htmlToMarkdown", "stripUrlParams", "altTextImages", "collapseWhitespace", "tokenReduction", "aiRules", "theme", "showDebugTab"]);
         logger.setDebug(store.debugLogging);
         await AiClassifier.setConfig(store);
         userTheme = store.theme || 'auto';
@@ -465,7 +489,6 @@ async function clearCacheForMessages(idsInput) {
         if (store.aiParams && typeof store.aiParams.max_tokens !== 'undefined') {
             maxTokens = parseInt(store.aiParams.max_tokens) || maxTokens;
         }
-        errorPending = store.errorPending === true;
         showDebugTab = store.showDebugTab === true;
         const savedStats = await storage.local.get('classifyStats');
         if (savedStats.classifyStats && typeof savedStats.classifyStats === 'object') {
@@ -524,10 +547,6 @@ async function clearCacheForMessages(idsInput) {
             if (changes.showDebugTab) {
                 showDebugTab = changes.showDebugTab.newValue === true;
             }
-            if (changes.errorPending) {
-                errorPending = changes.errorPending.newValue === true;
-                updateActionIcon();
-            }
             if (changes.theme) {
                 userTheme = changes.theme.newValue || 'auto';
                 currentTheme = userTheme === 'auto' ? await detectSystemTheme() : userTheme;
@@ -720,6 +739,8 @@ async function clearCacheForMessages(idsInput) {
             }
         } else if (msg?.type === "sortana:getQueueCount") {
             return { count: queuedCount + (processing ? 1 : 0) };
+        } else if (msg?.type === "sortana:getErrorLog") {
+            return { errors: errorLog.slice() };
         } else if (msg?.type === "sortana:getTiming") {
             const t = timingStats;
             const std = t.count > 1 ? Math.sqrt(t.m2 / (t.count - 1)) : 0;
@@ -751,6 +772,7 @@ async function clearCacheForMessages(idsInput) {
     // Catch any unhandled rejections
     window.addEventListener("unhandledrejection", ev => {
         logger.aiLog("Unhandled promise rejection", { level: 'error' }, ev.reason);
+        recordError("Unhandled promise rejection", ev.reason);
     });
 
     browser.notifications.onClicked.addListener(id => {
diff --git a/options/options.html b/options/options.html
index b118ee0..fd8700c 100644
--- a/options/options.html
+++ b/options/options.html
@@ -51,6 +51,7 @@
                             <li class="is-active" data-tab="settings"><a><span class="icon is-small"><img data-icon="settings" data-size="16" src="../resources/img/settings-light-16.png" alt=""></span><span>Settings</span></a></li>
                             <li data-tab="rules"><a><span class="icon is-small"><img data-icon="clipboarddata" data-size="16" src="../resources/img/clipboarddata-light-16.png" alt=""></span><span>Rules</span></a></li>
                             <li data-tab="maintenance"><a><span class="icon is-small"><img data-icon="gear" data-size="16" src="../resources/img/gear-light-16.png" alt=""></span><span>Maintenance</span></a></li>
+                            <li id="errors-tab-button" class="is-hidden" data-tab="errors"><a><span class="icon is-small"><img data-icon="x" data-size="16" src="../resources/img/x-light-16.png" alt=""></span><span>Errors</span></a></li>
                             <li id="debug-tab-button" class="is-hidden" data-tab="debug"><a><span class="icon is-small"><img data-icon="average" data-size="16" src="../resources/img/average-light-16.png" alt=""></span><span>Debug</span></a></li>
                         </ul>
                     </div>
@@ -285,6 +286,32 @@
                 </div>
             </div>
 
+            <div id="errors-tab" class="tab-content is-hidden">
+                <h2 class="title is-4">
+                    <span class="icon is-small"><img data-icon="x" data-size="16" src="../resources/img/x-light-16.png" alt=""></span>
+                    <span>Session Errors</span>
+                </h2>
+                <div id="errors-empty" class="notification is-success is-light">
+                    No errors have been recorded since the last start.
+                </div>
+                <div id="errors-panel" class="is-hidden">
+                    <div class="box mb-4">
+                        <div class="level">
+                            <div class="level-left">
+                                <div>
+                                    <p class="title is-5 mb-1">Error Log</p>
+                                    <p class="subtitle is-6">Visible only for this session.</p>
+                                </div>
+                            </div>
+                            <div class="level-right">
+                                <span class="tag is-danger is-light" id="errors-count">0</span>
+                            </div>
+                        </div>
+                    </div>
+                    <div id="errors-list"></div>
+                </div>
+            </div>
+
             <div id="debug-tab" class="tab-content is-hidden">
                 <h2 class="title is-4">
                     <span class="icon is-small"><img data-icon="average" data-size="16" src="../resources/img/average-light-16.png" alt=""></span>
diff --git a/options/options.js b/options/options.js
index 046c674..d905d7d 100644
--- a/options/options.js
+++ b/options/options.js
@@ -196,6 +196,11 @@ document.addEventListener('DOMContentLoaded', async () => {
 
     const debugTabToggle = document.getElementById('show-debug-tab');
     const debugTabBtn = document.getElementById('debug-tab-button');
+    const errorTabBtn = document.getElementById('errors-tab-button');
+    const errorsEmpty = document.getElementById('errors-empty');
+    const errorsPanel = document.getElementById('errors-panel');
+    const errorsList = document.getElementById('errors-list');
+    const errorsCount = document.getElementById('errors-count');
     function updateDebugTab() {
         const visible = debugTabToggle.checked;
         debugTabBtn.classList.toggle('is-hidden', !visible);
@@ -204,6 +209,71 @@ document.addEventListener('DOMContentLoaded', async () => {
     debugTabToggle.addEventListener('change', () => { updateDebugTab(); markDirty(); });
     updateDebugTab();
 
+    function formatErrorTime(value) {
+        try {
+            return new Date(value).toLocaleString();
+        } catch (e) {
+            return '';
+        }
+    }
+
+    function renderErrors(entries = []) {
+        const hasErrors = entries.length > 0;
+        errorTabBtn.classList.toggle('is-hidden', !hasErrors);
+        errorsEmpty.classList.toggle('is-hidden', hasErrors);
+        errorsPanel.classList.toggle('is-hidden', !hasErrors);
+        errorsList.innerHTML = '';
+        errorsCount.textContent = String(entries.length);
+        if (!hasErrors) {
+            return;
+        }
+        entries.forEach(entry => {
+            const card = document.createElement('article');
+            card.className = 'message is-danger is-light mb-4';
+            const header = document.createElement('div');
+            header.className = 'message-header';
+            const title = document.createElement('p');
+            title.textContent = entry.context || 'Error';
+            const time = document.createElement('span');
+            time.className = 'is-size-7 has-text-weight-normal';
+            time.textContent = formatErrorTime(entry.time);
+            header.appendChild(title);
+            header.appendChild(time);
+            const body = document.createElement('div');
+            body.className = 'message-body';
+            const summary = document.createElement('p');
+            summary.className = 'mb-2';
+            summary.textContent = entry.message || 'Unknown error';
+            body.appendChild(summary);
+            if (entry.detail) {
+                const detail = document.createElement('pre');
+                detail.className = 'is-family-monospace is-size-7';
+                detail.textContent = entry.detail;
+                body.appendChild(detail);
+            }
+            card.appendChild(header);
+            card.appendChild(body);
+            errorsList.appendChild(card);
+        });
+    }
+
+    async function loadErrors() {
+        try {
+            const response = await browser.runtime.sendMessage({ type: 'sortana:getErrorLog' });
+            renderErrors(response?.errors || []);
+        } catch (e) {
+            renderErrors([]);
+        }
+    }
+
+    browser.runtime.onMessage.addListener((msg) => {
+        if (msg?.type === 'sortana:errorLogUpdated') {
+            loadErrors();
+        }
+    });
+
+    await loadErrors();
+
     updateDiffDisplay();
 
     [htmlToggle, stripUrlToggle, altTextToggle, collapseWhitespaceToggle, tokenReductionToggle].forEach(toggle => {