diff --git a/extension/background.js b/extension/background.js
index 0c7155c..3cc6dbb 100644
--- a/extension/background.js
+++ b/extension/background.js
@@ -523,6 +523,7 @@ function markRoomPotentiallyIdle() {
 }
 
 function clearTargetTabForIdle() {
+    if (currentTabId) chrome.tabs.sendMessage(Number(currentTabId), { type: 'CHAT_DESTROY' }).catch(() => {});
     currentTabId = null;
     currentTabTitle = null;
     lastContentHeartbeatAt = null;
@@ -550,6 +551,7 @@ async function leaveRoomAfterIdleGrace(reason) {
     // Notify content.js/popup BEFORE currentTabId is cleared so they can reset
     // any stale guest-side HCM state (dialog/badge/desync) — H-2.
     broadcastControlMode();
+    if (currentTabId) chrome.tabs.sendMessage(Number(currentTabId), { type: 'CHAT_DESTROY' }).catch(() => {});
     currentTabId = null;
     currentTabTitle = null;
     roomIdleSince = null;
@@ -1049,6 +1051,7 @@ async function handleServerEvent(event, data) {
             hostPeerId = data.hostPeerId || null;
             controllers = Array.isArray(data.controllers) ? data.controllers : [];
             serverCapabilities = Array.isArray(data.capabilities) ? data.capabilities : [];
+            if (currentTabId) chrome.tabs.sendMessage(Number(currentTabId), { type: 'CHAT_CONTEXT_UPDATE' }).catch(() => {});
             hcmEnforceDesyncInvariant();
             broadcastControlMode();
             markRoomPotentiallyIdle();
@@ -1829,7 +1832,7 @@ async function injectContentScript(tabId) {
     });
     return chrome.scripting.executeScript({
         target: { tabId },
-        files: ['content.js']
+        files: ['chat-format.js', 'chat-overlay.js', 'content.js']
     });
 }
 
@@ -1899,6 +1902,7 @@ chrome.alarms.onAlarm.addListener(async (alarm) => {
 
 function leaveOldRoomIfSwitching(newRoomId) {
     if (currentRoom && currentRoom.roomId !== newRoomId) {
+        if (currentTabId) chrome.tabs.sendMessage(Number(currentTabId), { type: 'CHAT_RESET' }).catch(() => {});
         addLog(`Switching rooms: leaving ${currentRoom.roomId} to join ${newRoomId}`, 'info');
         forceDisconnect();
         currentRoom = null;
@@ -2033,6 +2037,41 @@ async function handleAsyncMessage(message, sender, sendResponse) {
             chatSupported: serverSupports(CAPABILITIES.CHAT),
             hasChatKey: !!(await getSettings()).chatKey
         });
+    } else if (message.type === 'GET_CHAT_CONTEXT') {
+        const senderTabId = sender.tab?.id;
+        if (!currentRoom || !currentTabId || senderTabId !== Number(currentTabId)) {
+            sendResponse({ supported: false, hasKey: false });
+            return;
+        }
+        const settings = await getSettings();
+        const localeData = await chrome.storage.local.get(['locale']);
+        await loadLocale(localeData.locale || getSystemLanguage());
+        const translated = key => {
+            const value = getMessage(key);
+            return value === key ? '' : value;
+        };
+        sendResponse({
+            supported: serverSupports(CAPABILITIES.CHAT),
+            hasKey: !!settings.chatKey,
+            peerId,
+            roomId: currentRoom.roomId,
+            strings: {
+                title: translated('CHAT_TITLE'),
+                liveOnly: translated('CHAT_LIVE_ONLY'),
+                open: translated('CHAT_OPEN'),
+                close: translated('CHAT_CLOSE'),
+                dockLeft: translated('CHAT_DOCK_LEFT'),
+                dockRight: translated('CHAT_DOCK_RIGHT'),
+                detached: translated('CHAT_DETACHED'),
+                placeholder: translated('CHAT_PLACEHOLDER'),
+                send: translated('CHAT_SEND'),
+                missingKey: translated('CHAT_MISSING_KEY'),
+                tooLong: translated('CHAT_TOO_LONG'),
+                sendFailed: translated('CHAT_SEND_FAILED'),
+                empty: translated('CHAT_EMPTY'),
+                you: translated('LABEL_YOU')
+            }
+        });
     } else if (message.type === 'CHAT_SEND') {
         const senderTabId = sender.tab?.id;
         if (!currentRoom || !currentTabId || senderTabId !== Number(currentTabId)) {
@@ -2150,6 +2189,7 @@ async function handleAsyncMessage(message, sender, sendResponse) {
         // Notify content.js/popup BEFORE currentTabId is cleared so they drop any
         // stale guest-side HCM state (dialog/badge/desync) — H-2/H-3.
         broadcastControlMode();
+        if (currentTabId) chrome.tabs.sendMessage(Number(currentTabId), { type: 'CHAT_DESTROY' }).catch(() => {});
         currentTabId = null;
         currentTabTitle = null;
         roomIdleSince = null;
@@ -2223,6 +2263,7 @@ async function handleAsyncMessage(message, sender, sendResponse) {
 
             if (roomId && currentRoom && currentRoom.roomId === roomId && socket && socket.readyState === WebSocket.OPEN && isNamespaceJoined && desiredUrl === currentServerUrl) {
                 broadcastConnectionStatus('connected');
+                if (currentTabId) chrome.tabs.sendMessage(Number(currentTabId), { type: 'CHAT_CONTEXT_UPDATE' }).catch(() => {});
                 const tabs = await new Promise(resolve => chrome.tabs.query({}, resolve));
                 for (const tab of tabs) {
                     chrome.tabs.sendMessage(tab.id, { type: 'JOIN_STATUS', success: true, message: 'Already in room' }).catch(() => {});
@@ -2550,6 +2591,7 @@ async function handleAsyncMessage(message, sender, sendResponse) {
 
         if (previousTabId && previousTabId !== currentTabId) {
             resetAudioProcessingInTab(previousTabId);
+            chrome.tabs.sendMessage(Number(previousTabId), { type: 'CHAT_DESTROY' }).catch(() => {});
         }
         
         if (currentTabId) {
diff --git a/extension/chat-format.js b/extension/chat-format.js
new file mode 100644
index 0000000..766eb40
--- /dev/null
+++ b/extension/chat-format.js
@@ -0,0 +1,33 @@
+(function exposeChatFormat(root) {
+    function escapeChatHtml(value) {
+        return String(value ?? '')
+            .replace(/&/g, '&')
+            .replace(/</g, '&lt;')
+            .replace(/>/g, '&gt;')
+            .replace(/"/g, '&quot;')
+            .replace(/'/g, '&#039;');
+    }
+
+    function formatChatText(value) {
+        return escapeChatHtml(value)
+            .replace(/\*\*([^*\n]+)\*\*/g, '<strong>$1</strong>')
+            .replace(/\*([^*\n]+)\*/g, '<em>$1</em>');
+    }
+
+    function tokenizeChatText(value) {
+        const text = String(value ?? '');
+        const tokens = [];
+        const pattern = /\*\*([^*\n]+)\*\*|\*([^*\n]+)\*/g;
+        let cursor = 0;
+        let match;
+        while ((match = pattern.exec(text)) !== null) {
+            if (match.index > cursor) tokens.push({ type: 'text', text: text.slice(cursor, match.index) });
+            tokens.push({ type: match[1] !== undefined ? 'strong' : 'em', text: match[1] ?? match[2] });
+            cursor = pattern.lastIndex;
+        }
+        if (cursor < text.length) tokens.push({ type: 'text', text: text.slice(cursor) });
+        return tokens;
+    }
+
+    root.KoalaSyncChatFormat = Object.freeze({ escapeChatHtml, formatChatText, tokenizeChatText });
+})(globalThis);
diff --git a/extension/chat-format.test.mjs b/extension/chat-format.test.mjs
new file mode 100644
index 0000000..ece1295
--- /dev/null
+++ b/extension/chat-format.test.mjs
@@ -0,0 +1,22 @@
+import { beforeAll, describe, expect, it } from 'vitest';
+
+beforeAll(async () => {
+    await import('./chat-format.js');
+});
+
+describe('chat formatting', () => {
+    it('escapes executable HTML before applying limited Markdown', () => {
+        const result = globalThis.KoalaSyncChatFormat.formatChatText('<img src=x onerror=alert(1)> **bold** *italic*');
+        expect(result).toBe('&lt;img src=x onerror=alert(1)&gt; <strong>bold</strong> <em>italic</em>');
+        expect(result).not.toContain('<img');
+    });
+
+    it('tokenizes only text, strong, and emphasis nodes', () => {
+        expect(globalThis.KoalaSyncChatFormat.tokenizeChatText('<script>x</script> **bold** *italic*')).toEqual([
+            { type: 'text', text: '<script>x</script> ' },
+            { type: 'strong', text: 'bold' },
+            { type: 'text', text: ' ' },
+            { type: 'em', text: 'italic' }
+        ]);
+    });
+});
diff --git a/extension/chat-overlay-contract.test.mjs b/extension/chat-overlay-contract.test.mjs
new file mode 100644
index 0000000..fe488f5
--- /dev/null
+++ b/extension/chat-overlay-contract.test.mjs
@@ -0,0 +1,58 @@
+import fs from 'node:fs';
+import path from 'node:path';
+import { describe, expect, it } from 'vitest';
+
+const extensionDir = path.dirname(new URL(import.meta.url).pathname);
+const overlaySource = fs.readFileSync(path.join(extensionDir, 'chat-overlay.js'), 'utf8');
+const backgroundSource = fs.readFileSync(path.join(extensionDir, 'background.js'), 'utf8');
+const localeDir = path.join(extensionDir, 'locales');
+const chatKeys = [
+    'CHAT_TITLE',
+    'CHAT_LIVE_ONLY',
+    'CHAT_OPEN',
+    'CHAT_CLOSE',
+    'CHAT_DOCK_LEFT',
+    'CHAT_DOCK_RIGHT',
+    'CHAT_DETACHED',
+    'CHAT_PLACEHOLDER',
+    'CHAT_SEND',
+    'CHAT_MISSING_KEY',
+    'CHAT_TOO_LONG',
+    'CHAT_SEND_FAILED',
+    'CHAT_EMPTY'
+];
+
+describe('chat overlay contract', () => {
+    it('isolates the overlay and never renders markup as HTML', () => {
+        expect(overlaySource).toContain("attachShadow({ mode: 'open' })");
+        expect(overlaySource).not.toMatch(/\.innerHTML\s*=|insertAdjacentHTML|\.outerHTML\s*=/);
+        expect(overlaySource).toContain('document.createTextNode(token.text)');
+    });
+
+    it('injects formatting and overlay code only with the selected-tab content script', () => {
+        expect(backgroundSource).toContain("files: ['chat-format.js', 'chat-overlay.js', 'content.js']");
+        expect(overlaySource).toContain("const storageKey = `chatOverlayLayout:${location.origin}`");
+        expect(overlaySource).toContain('document.fullscreenElement || document.documentElement');
+    });
+
+    it('supports all layout and theme combinations with bounded message DOM', () => {
+        expect(overlaySource).toContain("['left', 'right', 'detached']");
+        expect(overlaySource).toContain("#app[data-palette=\"cyber\"][data-theme=\"light\"]");
+        expect(overlaySource).toContain("#app[data-palette=\"graphite\"][data-theme=\"light\"]");
+        expect(overlaySource).toContain('const MAX_MESSAGES = 200');
+        expect(overlaySource).toContain('while (messages.querySelectorAll(\'.message\').length > MAX_MESSAGES)');
+    });
+
+    it('contains every chat string in all 15 extension locales', () => {
+        const localeFiles = fs.readdirSync(localeDir).filter(file => file.endsWith('.json')).sort();
+        expect(localeFiles).toHaveLength(15);
+        for (const file of localeFiles) {
+            const messages = JSON.parse(fs.readFileSync(path.join(localeDir, file), 'utf8'));
+            for (const key of chatKeys) {
+                expect(messages[key], `${file}: ${key}`).toBeTypeOf('string');
+                expect(messages[key], `${file}: ${key}`).not.toBe('');
+                expect(messages[key], `${file}: ${key}`).not.toMatch(/[—–]/);
+            }
+        }
+    });
+});
diff --git a/extension/chat-overlay.js b/extension/chat-overlay.js
new file mode 100644
index 0000000..0c98950
--- /dev/null
+++ b/extension/chat-overlay.js
@@ -0,0 +1,467 @@
+(function initKoalaSyncChatOverlay() {
+    if (window.koalaSyncChatOverlay?.refresh) {
+        window.koalaSyncChatOverlay.refresh();
+        return;
+    }
+
+    const MAX_MESSAGES = 200;
+    const MIN_WIDTH = 300;
+    const MIN_HEIGHT = 320;
+    const DEFAULT_WIDTH = 360;
+    const DEFAULT_HEIGHT = 520;
+    const storageKey = `chatOverlayLayout:${location.origin}`;
+    const systemTheme = window.matchMedia('(prefers-color-scheme: light)');
+    let context = null;
+    let opened = false;
+    let destroyed = false;
+    let saveTimer = null;
+    let applyingLayout = false;
+    let layout = { mode: 'right', x: 24, y: 72, width: DEFAULT_WIDTH, height: DEFAULT_HEIGHT };
+    let themeMode = 'system';
+    let themePalette = 'eucalyptus';
+
+    const host = document.createElement('div');
+    host.id = 'koalasync-chat-overlay-host';
+    host.style.cssText = 'all:initial;position:fixed;inset:0;z-index:2147483647;pointer-events:none;contain:layout style paint;transform:translateZ(0);';
+    const shadow = host.attachShadow({ mode: 'open' });
+    const style = document.createElement('style');
+    style.textContent = `
+        :host { all: initial; }
+        * { box-sizing: border-box; }
+        #app {
+            --bg: oklch(0.205 0.025 155); --card: oklch(0.30 0.035 150);
+            --surface-alt: oklch(0.265 0.032 150); --surface-deep: oklch(0.205 0.025 155);
+            --accent: oklch(0.73 0.13 155); --accent-hover: oklch(0.79 0.12 155);
+            --text: oklch(0.96 0.01 90); --text-muted: oklch(0.78 0.02 90);
+            --border-soft: oklch(0.88 0.025 145 / 0.09); --border-strong: oklch(0.39 0.038 145);
+            --text-on-green: oklch(0.14 0.02 90); --danger: oklch(0.63 0.18 25);
+            position: fixed; inset: 0; pointer-events: none; color: var(--text);
+            font: 14px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+        }
+        #app[data-theme="light"] {
+            --bg: oklch(0.935 0.018 110); --card: oklch(0.995 0.006 100);
+            --surface-alt: oklch(0.91 0.022 115); --surface-deep: oklch(0.935 0.018 110);
+            --accent: oklch(0.52 0.13 155); --accent-hover: oklch(0.45 0.12 155);
+            --text: oklch(0.21 0.03 140); --text-muted: oklch(0.43 0.03 135);
+            --border-soft: oklch(0.28 0.035 140 / 0.10); --border-strong: oklch(0.73 0.035 125);
+            --text-on-green: oklch(0.16 0.03 140);
+        }
+        #app[data-palette="cyber"] {
+            --bg: oklch(0.185 0.04 265); --card: oklch(0.285 0.05 265);
+            --surface-alt: oklch(0.25 0.048 265); --surface-deep: oklch(0.185 0.04 265);
+            --accent: oklch(0.59 0.20 275); --accent-hover: oklch(0.69 0.17 275);
+            --text: oklch(0.97 0.012 265); --text-muted: oklch(0.74 0.03 265);
+            --border-soft: oklch(0.9 0.03 265 / 0.10); --border-strong: oklch(0.42 0.05 265);
+            --text-on-green: oklch(0.99 0.006 275);
+        }
+        #app[data-palette="cyber"][data-theme="light"] {
+            --bg: oklch(0.945 0.014 265); --card: oklch(0.995 0.005 265);
+            --surface-alt: oklch(0.915 0.02 265); --surface-deep: oklch(0.945 0.014 265);
+            --accent: oklch(0.53 0.21 275); --accent-hover: oklch(0.46 0.20 275);
+            --text: oklch(0.26 0.05 265); --text-muted: oklch(0.48 0.045 265);
+            --border-soft: oklch(0.30 0.05 265 / 0.12); --border-strong: oklch(0.79 0.03 265);
+            --text-on-green: oklch(0.99 0.005 275);
+        }
+        #app[data-palette="graphite"] {
+            --bg: oklch(0.165 0.004 260); --card: oklch(0.255 0.005 260);
+            --surface-alt: oklch(0.225 0.005 260); --surface-deep: oklch(0.165 0.004 260);
+            --accent: oklch(0.93 0.006 260); --accent-hover: oklch(0.99 0.003 260);
+            --text: oklch(0.97 0.003 260); --text-muted: oklch(0.72 0.005 260);
+            --border-soft: oklch(0.92 0.008 260 / 0.11); --border-strong: oklch(0.42 0.006 260);
+            --text-on-green: oklch(0.20 0.004 260);
+        }
+        #app[data-palette="graphite"][data-theme="light"] {
+            --bg: oklch(0.928 0.003 260); --card: oklch(1 0 0);
+            --surface-alt: oklch(0.90 0.004 260); --surface-deep: oklch(0.928 0.003 260);
+            --accent: oklch(0.28 0.006 260); --accent-hover: oklch(0.18 0.005 260);
+            --text: oklch(0.22 0.005 260); --text-muted: oklch(0.46 0.006 260);
+            --border-soft: oklch(0.20 0.006 260 / 0.13); --border-strong: oklch(0.77 0.004 260);
+            --text-on-green: oklch(0.98 0.002 260);
+        }
+        button, textarea { font: inherit; }
+        button { color: inherit; }
+        .launcher {
+            position: fixed; width: 48px; height: 48px; border: 1px solid var(--border-strong);
+            border-radius: 16px; background: var(--card); color: var(--text); cursor: pointer;
+            pointer-events: auto; box-shadow: 0 10px 28px rgb(0 0 0 / .32); font-size: 22px;
+        }
+        .launcher:hover:not(:disabled) { border-color: var(--accent); transform: translateY(-1px); }
+        .launcher:disabled { cursor: not-allowed; opacity: .58; }
+        .panel {
+            position: fixed; display: none; flex-direction: column; overflow: hidden;
+            min-width: ${MIN_WIDTH}px; min-height: ${MIN_HEIGHT}px; max-width: calc(100vw - 16px);
+            max-height: calc(100vh - 16px); pointer-events: auto; color: var(--text);
+            background: var(--card); border: 1px solid var(--border-strong); border-radius: 18px;
+            box-shadow: 0 18px 55px rgb(0 0 0 / .38); transform: translateZ(0);
+        }
+        .panel.open { display: flex; }
+        .header { display: flex; align-items: center; gap: 10px; padding: 12px; border-bottom: 1px solid var(--border-soft); user-select: none; }
+        .header.detached { cursor: move; }
+        .heading { min-width: 0; flex: 1; }
+        .title { font-size: 14px; font-weight: 760; }
+        .subtitle { color: var(--text-muted); font-size: 11px; }
+        .modes { display: flex; gap: 4px; }
+        .icon-button { width: 30px; height: 30px; border: 1px solid var(--border-soft); border-radius: 9px; background: var(--surface-alt); cursor: pointer; }
+        .icon-button:hover, .icon-button.active { border-color: var(--accent); color: var(--accent); }
+        .messages { flex: 1; min-height: 0; overflow-y: auto; padding: 12px; background: var(--bg); overscroll-behavior: contain; }
+        .empty { color: var(--text-muted); text-align: center; padding: 32px 12px; font-size: 12px; }
+        .message { margin-bottom: 11px; overflow-wrap: anywhere; }
+        .meta { display: flex; align-items: baseline; gap: 7px; margin-bottom: 2px; }
+        .sender { color: var(--accent); font-weight: 700; font-size: 12px; }
+        .time { color: var(--text-muted); font-size: 10px; }
+        .body { white-space: pre-wrap; color: var(--text); }
+        .composer { padding: 10px; border-top: 1px solid var(--border-soft); background: var(--card); }
+        textarea { width: 100%; min-height: 62px; max-height: 132px; resize: vertical; border: 1px solid var(--border-strong); border-radius: 11px; padding: 9px; background: var(--surface-deep); color: var(--text); outline: none; }
+        textarea:focus { border-color: var(--accent); }
+        textarea::placeholder { color: var(--text-muted); }
+        .composer-row { display: flex; align-items: center; gap: 8px; margin-top: 7px; }
+        .count { flex: 1; color: var(--text-muted); font-size: 10px; }
+        .status { color: var(--danger); font-size: 10px; min-height: 14px; }
+        .send { border: 0; border-radius: 10px; padding: 8px 13px; background: var(--accent); color: var(--text-on-green); font-weight: 750; cursor: pointer; }
+        .send:hover:not(:disabled) { background: var(--accent-hover); }
+        .send:disabled { opacity: .55; cursor: wait; }
+        @media (max-width: 520px) { .panel { max-width: calc(100vw - 12px); } }
+        @media (prefers-reduced-motion: reduce) { * { transition: none !important; } }
+    `;
+
+    function element(tag, className, text) {
+        const node = document.createElement(tag);
+        if (className) node.className = className;
+        if (text !== undefined) node.textContent = text;
+        return node;
+    }
+
+    const app = element('div');
+    app.id = 'app';
+    const launcher = element('button', 'launcher', '💬');
+    launcher.type = 'button';
+    const panel = element('section', 'panel');
+    panel.setAttribute('role', 'dialog');
+    const header = element('header', 'header');
+    const heading = element('div', 'heading');
+    const title = element('div', 'title');
+    const subtitle = element('div', 'subtitle');
+    heading.append(title, subtitle);
+    const modes = element('div', 'modes');
+    const leftButton = element('button', 'icon-button', '←');
+    const detachedButton = element('button', 'icon-button', '↗');
+    const rightButton = element('button', 'icon-button', '→');
+    const closeButton = element('button', 'icon-button', '×');
+    for (const button of [leftButton, detachedButton, rightButton, closeButton]) button.type = 'button';
+    modes.append(leftButton, detachedButton, rightButton, closeButton);
+    header.append(heading, modes);
+    const messages = element('div', 'messages');
+    messages.setAttribute('aria-live', 'polite');
+    const empty = element('div', 'empty');
+    messages.append(empty);
+    const composer = element('form', 'composer');
+    const textarea = element('textarea');
+    const composerRow = element('div', 'composer-row');
+    const count = element('span', 'count', '0/500');
+    const sendButton = element('button', 'send');
+    sendButton.type = 'submit';
+    composerRow.append(count, sendButton);
+    const status = element('div', 'status');
+    composer.append(textarea, composerRow, status);
+    panel.append(header, messages, composer);
+    app.append(launcher, panel);
+    shadow.append(style, app);
+    document.documentElement.append(host);
+
+    function messageRuntime(payload) {
+        return new Promise(resolve => {
+            try {
+                chrome.runtime.sendMessage(payload, response => {
+                    if (chrome.runtime.lastError) resolve(null);
+                    else resolve(response || null);
+                });
+            } catch (_) {
+                resolve(null);
+            }
+        });
+    }
+
+    function strings() {
+        return context?.strings || {};
+    }
+
+    function applyStrings() {
+        const text = strings();
+        title.textContent = text.title || '';
+        subtitle.textContent = text.liveOnly || '';
+        launcher.setAttribute('aria-label', text.open || '');
+        launcher.title = context?.supported && !context?.hasKey ? (text.missingKey || '') : (text.open || '');
+        panel.setAttribute('aria-label', text.title || '');
+        textarea.placeholder = text.placeholder || '';
+        sendButton.textContent = text.send || '';
+        empty.textContent = text.empty || '';
+        leftButton.title = text.dockLeft || '';
+        detachedButton.title = text.detached || '';
+        rightButton.title = text.dockRight || '';
+        closeButton.title = text.close || '';
+        leftButton.setAttribute('aria-label', text.dockLeft || '');
+        detachedButton.setAttribute('aria-label', text.detached || '');
+        rightButton.setAttribute('aria-label', text.dockRight || '');
+        closeButton.setAttribute('aria-label', text.close || '');
+    }
+
+    function applyTheme() {
+        const light = themeMode === 'light' || (themeMode === 'system' && systemTheme.matches);
+        app.dataset.theme = light ? 'light' : 'dark';
+        app.dataset.palette = ['eucalyptus', 'cyber', 'graphite'].includes(themePalette) ? themePalette : 'eucalyptus';
+    }
+
+    function viewportBounds() {
+        return { width: Math.max(320, window.innerWidth), height: Math.max(360, window.innerHeight) };
+    }
+
+    function clampDetached() {
+        const viewport = viewportBounds();
+        layout.width = Math.min(Math.max(Number(layout.width) || DEFAULT_WIDTH, MIN_WIDTH), Math.min(600, viewport.width - 16));
+        layout.height = Math.min(Math.max(Number(layout.height) || DEFAULT_HEIGHT, MIN_HEIGHT), viewport.height - 16);
+        layout.x = Math.min(Math.max(Number(layout.x) || 8, 8), Math.max(8, viewport.width - layout.width - 8));
+        layout.y = Math.min(Math.max(Number(layout.y) || 8, 8), Math.max(8, viewport.height - layout.height - 8));
+    }
+
+    function saveLayout() {
+        if (saveTimer) clearTimeout(saveTimer);
+        saveTimer = setTimeout(() => {
+            saveTimer = null;
+            chrome.storage.local.set({ [storageKey]: layout }).catch(() => {});
+        }, 150);
+    }
+
+    function applyLayout() {
+        applyingLayout = true;
+        panel.style.right = 'auto';
+        panel.style.left = 'auto';
+        panel.style.bottom = 'auto';
+        panel.style.resize = 'none';
+        header.classList.toggle('detached', layout.mode === 'detached');
+        leftButton.classList.toggle('active', layout.mode === 'left');
+        detachedButton.classList.toggle('active', layout.mode === 'detached');
+        rightButton.classList.toggle('active', layout.mode === 'right');
+        if (layout.mode === 'detached') {
+            clampDetached();
+            panel.style.left = `${layout.x}px`;
+            panel.style.top = `${layout.y}px`;
+            panel.style.width = `${layout.width}px`;
+            panel.style.height = `${layout.height}px`;
+            panel.style.resize = 'both';
+            launcher.style.left = `${layout.x}px`;
+            launcher.style.right = 'auto';
+            launcher.style.top = `${layout.y}px`;
+        } else {
+            panel.style.top = '64px';
+            panel.style.width = `${DEFAULT_WIDTH}px`;
+            panel.style.height = 'min(560px, calc(100vh - 80px))';
+            panel.style[layout.mode] = '16px';
+            launcher.style.top = 'calc(50vh - 24px)';
+            launcher.style.left = layout.mode === 'left' ? '16px' : 'auto';
+            launcher.style.right = layout.mode === 'right' ? '16px' : 'auto';
+        }
+        globalThis.queueMicrotask(() => { applyingLayout = false; });
+    }
+
+    function setMode(mode) {
+        if (!['left', 'right', 'detached'].includes(mode)) return;
+        if (mode === 'detached' && layout.mode !== 'detached') {
+            layout.x = Math.max(8, Math.round((window.innerWidth - DEFAULT_WIDTH) / 2));
+            layout.y = Math.max(8, Math.round((window.innerHeight - DEFAULT_HEIGHT) / 2));
+        }
+        layout.mode = mode;
+        applyLayout();
+        saveLayout();
+    }
+
+    function setOpened(next) {
+        opened = !!next && !!context?.enabled;
+        panel.classList.toggle('open', opened);
+        launcher.style.display = opened ? 'none' : '';
+        if (opened) {
+            textarea.focus();
+            messages.scrollTop = messages.scrollHeight;
+        }
+    }
+
+    function applyContext(next) {
+        const previousRoomId = context?.roomId;
+        context = next || null;
+        const supported = !!context?.supported;
+        const hasKey = !!context?.hasKey;
+        context = context ? { ...context, enabled: supported && hasKey } : null;
+        if (previousRoomId && previousRoomId !== context?.roomId) clearMessages();
+        host.style.display = supported ? '' : 'none';
+        launcher.disabled = !hasKey;
+        if (!supported || !hasKey) setOpened(false);
+        applyStrings();
+        applyLayout();
+    }
+
+    async function refresh() {
+        if (destroyed) return;
+        applyContext(await messageRuntime({ type: 'GET_CHAT_CONTEXT' }));
+    }
+
+    function appendMessage(message) {
+        if (!context?.enabled || !message || typeof message.text !== 'string') return;
+        if (empty.isConnected) empty.remove();
+        const wrapper = element('article', 'message');
+        const meta = element('div', 'meta');
+        const own = message.senderId === context.peerId;
+        const sender = element('span', 'sender', own ? (strings().you || '') : (message.username || message.senderId || ''));
+        const time = element('time', 'time');
+        const date = new Date(message.timestamp);
+        time.textContent = Number.isFinite(date.getTime()) ? date.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' }) : '';
+        meta.append(sender, time);
+        const body = element('div', 'body');
+        const tokens = globalThis.KoalaSyncChatFormat?.tokenizeChatText(message.text) || [{ type: 'text', text: message.text }];
+        for (const token of tokens) {
+            const node = token.type === 'strong' ? document.createElement('strong') : token.type === 'em' ? document.createElement('em') : document.createTextNode(token.text);
+            if (node.nodeType === 1) node.textContent = token.text;
+            body.append(node);
+        }
+        wrapper.append(meta, body);
+        messages.append(wrapper);
+        while (messages.querySelectorAll('.message').length > MAX_MESSAGES) messages.querySelector('.message')?.remove();
+        messages.scrollTop = messages.scrollHeight;
+    }
+
+    function clearMessages() {
+        messages.replaceChildren(empty);
+    }
+
+    launcher.addEventListener('click', () => setOpened(true));
+    closeButton.addEventListener('click', () => setOpened(false));
+    leftButton.addEventListener('click', () => setMode('left'));
+    detachedButton.addEventListener('click', () => setMode('detached'));
+    rightButton.addEventListener('click', () => setMode('right'));
+
+    textarea.addEventListener('input', () => {
+        const length = [...textarea.value].length;
+        count.textContent = `${length}/500`;
+        count.style.color = length > 500 ? 'var(--danger)' : '';
+        status.textContent = length > 500 ? (strings().tooLong || '') : '';
+    });
+    textarea.addEventListener('keydown', event => {
+        if (event.key === 'Enter' && !event.shiftKey) {
+            event.preventDefault();
+            composer.requestSubmit();
+        }
+    });
+    composer.addEventListener('submit', async event => {
+        event.preventDefault();
+        const text = textarea.value.trim();
+        if (!text) return;
+        if ([...text].length > 500) {
+            status.textContent = strings().tooLong || '';
+            return;
+        }
+        sendButton.disabled = true;
+        status.textContent = '';
+        const response = await messageRuntime({ type: 'CHAT_SEND', text });
+        sendButton.disabled = false;
+        if (response?.status === 'ok') {
+            textarea.value = '';
+            count.textContent = '0/500';
+        } else {
+            status.textContent = response?.status === 'too_long' ? (strings().tooLong || '') : (strings().sendFailed || '');
+        }
+    });
+
+    let drag = null;
+    header.addEventListener('pointerdown', event => {
+        if (layout.mode !== 'detached' || event.target.closest('button')) return;
+        drag = { pointerId: event.pointerId, startX: event.clientX, startY: event.clientY, x: layout.x, y: layout.y };
+        header.setPointerCapture(event.pointerId);
+    });
+    header.addEventListener('pointermove', event => {
+        if (!drag || event.pointerId !== drag.pointerId) return;
+        layout.x = drag.x + event.clientX - drag.startX;
+        layout.y = drag.y + event.clientY - drag.startY;
+        clampDetached();
+        applyLayout();
+    });
+    header.addEventListener('pointerup', event => {
+        if (!drag || event.pointerId !== drag.pointerId) return;
+        drag = null;
+        saveLayout();
+    });
+
+    const resizeObserver = new globalThis.ResizeObserver(entries => {
+        if (applyingLayout || layout.mode !== 'detached') return;
+        const rect = entries[0]?.contentRect;
+        if (!opened || !rect?.width || !rect.height) return;
+        layout.width = rect.width;
+        layout.height = rect.height;
+        clampDetached();
+        saveLayout();
+    });
+    resizeObserver.observe(panel);
+
+    function moveIntoFullscreen() {
+        const parent = document.fullscreenElement || document.documentElement;
+        if (parent && host.parentNode !== parent) parent.append(host);
+        globalThis.requestAnimationFrame(applyLayout);
+    }
+
+    function handleResize() {
+        if (layout.mode === 'detached') {
+            clampDetached();
+            applyLayout();
+            saveLayout();
+        }
+    }
+
+    function handleSystemTheme() {
+        if (themeMode === 'system') applyTheme();
+    }
+
+    function handleStorage(changes, area) {
+        if (area !== 'local') return;
+        if (changes.themeMode) themeMode = changes.themeMode.newValue || 'system';
+        if (changes.themePalette) themePalette = changes.themePalette.newValue || 'eucalyptus';
+        if (changes.themeMode || changes.themePalette) applyTheme();
+        if (changes.locale) refresh();
+    }
+
+    function handleRuntime(message) {
+        if (message?.type === 'CHAT_MESSAGE') appendMessage(message.message);
+        if (message?.type === 'CHAT_CONTEXT_UPDATE') refresh();
+        if (message?.type === 'CHAT_RESET') {
+            clearMessages();
+            refresh();
+        }
+        if (message?.type === 'CHAT_DESTROY') destroy();
+    }
+
+    function destroy() {
+        if (destroyed) return;
+        destroyed = true;
+        if (saveTimer) clearTimeout(saveTimer);
+        resizeObserver.disconnect();
+        document.removeEventListener('fullscreenchange', moveIntoFullscreen);
+        window.removeEventListener('resize', handleResize);
+        systemTheme.removeEventListener('change', handleSystemTheme);
+        chrome.storage.onChanged.removeListener(handleStorage);
+        chrome.runtime.onMessage.removeListener(handleRuntime);
+        host.remove();
+        window.koalaSyncChatOverlay = null;
+    }
+
+    document.addEventListener('fullscreenchange', moveIntoFullscreen);
+    window.addEventListener('resize', handleResize, { passive: true });
+    systemTheme.addEventListener('change', handleSystemTheme);
+    chrome.storage.onChanged.addListener(handleStorage);
+    chrome.runtime.onMessage.addListener(handleRuntime);
+    chrome.storage.local.get([storageKey, 'themeMode', 'themePalette'], data => {
+        if (data[storageKey] && typeof data[storageKey] === 'object') layout = { ...layout, ...data[storageKey] };
+        themeMode = data.themeMode || 'system';
+        themePalette = data.themePalette || 'eucalyptus';
+        applyTheme();
+        applyLayout();
+    });
+
+    window.koalaSyncChatOverlay = { refresh, destroy };
+    refresh();
+})();
diff --git a/extension/locales/de.json b/extension/locales/de.json
index 6507be7..8f258da 100644
--- a/extension/locales/de.json
+++ b/extension/locales/de.json
@@ -243,5 +243,18 @@
   "LABEL_SETTINGS_GROUP_PROFILE": "Profil & Aussehen",
   "LABEL_SETTINGS_GROUP_PROFILE_TOOLTIP": "Ändere deinen Benutzernamen, dein Design und deine Spracheinstellungen.",
   "LABEL_SETTINGS_GROUP_SYNC": "Wiedergabe & Sync",
-  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Passe Wiedergabe-, Benachrichtigungs- und Audioeinstellungen an."
+  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Passe Wiedergabe-, Benachrichtigungs- und Audioeinstellungen an.",
+  "CHAT_TITLE": "Raum-Chat",
+  "CHAT_LIVE_ONLY": "Nur live. Kein Verlauf.",
+  "CHAT_OPEN": "Raum-Chat öffnen",
+  "CHAT_CLOSE": "Chat schließen",
+  "CHAT_DOCK_LEFT": "Chat links andocken",
+  "CHAT_DOCK_RIGHT": "Chat rechts andocken",
+  "CHAT_DETACHED": "Chat frei positionieren",
+  "CHAT_PLACEHOLDER": "Nachricht schreiben...",
+  "CHAT_SEND": "Senden",
+  "CHAT_MISSING_KEY": "Chat ist nur über einen aktuellen Einladungslink verfügbar.",
+  "CHAT_TOO_LONG": "Maximal 500 Zeichen.",
+  "CHAT_SEND_FAILED": "Nachricht konnte nicht gesendet werden.",
+  "CHAT_EMPTY": "Noch keine Nachrichten. Der Chat ist nur live."
 }
diff --git a/extension/locales/en.json b/extension/locales/en.json
index 25f5c04..0fb0ab3 100644
--- a/extension/locales/en.json
+++ b/extension/locales/en.json
@@ -243,5 +243,18 @@
   "LABEL_SETTINGS_GROUP_PROFILE": "Profile & Appearance",
   "LABEL_SETTINGS_GROUP_PROFILE_TOOLTIP": "Change your username, theme, and language preferences.",
   "LABEL_SETTINGS_GROUP_SYNC": "Playback & Sync",
-  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Customize playback, notifications, and audio preferences."
+  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Customize playback, notifications, and audio preferences.",
+  "CHAT_TITLE": "Room Chat",
+  "CHAT_LIVE_ONLY": "Live only. No history.",
+  "CHAT_OPEN": "Open room chat",
+  "CHAT_CLOSE": "Close chat",
+  "CHAT_DOCK_LEFT": "Dock chat left",
+  "CHAT_DOCK_RIGHT": "Dock chat right",
+  "CHAT_DETACHED": "Detach chat",
+  "CHAT_PLACEHOLDER": "Write a message...",
+  "CHAT_SEND": "Send",
+  "CHAT_MISSING_KEY": "Chat is available only through a current invite link.",
+  "CHAT_TOO_LONG": "Maximum 500 characters.",
+  "CHAT_SEND_FAILED": "Message could not be sent.",
+  "CHAT_EMPTY": "No messages yet. Chat is live only."
 }
diff --git a/extension/locales/es.json b/extension/locales/es.json
index 624e419..c9c9da9 100644
--- a/extension/locales/es.json
+++ b/extension/locales/es.json
@@ -243,5 +243,18 @@
   "LABEL_SETTINGS_GROUP_PROFILE": "Perfil y Apariencia",
   "LABEL_SETTINGS_GROUP_PROFILE_TOOLTIP": "Cambia tu nombre de usuario, tema y preferencias de idioma.",
   "LABEL_SETTINGS_GROUP_SYNC": "Reproducción y Sincronización",
-  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Personaliza la reproducción, las notificaciones y las preferencias de audio."
+  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Personaliza la reproducción, las notificaciones y las preferencias de audio.",
+  "CHAT_TITLE": "Chat de la sala",
+  "CHAT_LIVE_ONLY": "Solo en directo. Sin historial.",
+  "CHAT_OPEN": "Abrir chat de la sala",
+  "CHAT_CLOSE": "Cerrar chat",
+  "CHAT_DOCK_LEFT": "Acoplar chat a la izquierda",
+  "CHAT_DOCK_RIGHT": "Acoplar chat a la derecha",
+  "CHAT_DETACHED": "Separar chat",
+  "CHAT_PLACEHOLDER": "Escribe un mensaje...",
+  "CHAT_SEND": "Enviar",
+  "CHAT_MISSING_KEY": "El chat solo está disponible mediante un enlace de invitación actual.",
+  "CHAT_TOO_LONG": "Máximo 500 caracteres.",
+  "CHAT_SEND_FAILED": "No se pudo enviar el mensaje.",
+  "CHAT_EMPTY": "Aún no hay mensajes. El chat solo es en directo."
 }
diff --git a/extension/locales/fr.json b/extension/locales/fr.json
index 67e0408..ea6ee69 100644
--- a/extension/locales/fr.json
+++ b/extension/locales/fr.json
@@ -243,5 +243,18 @@
   "LABEL_SETTINGS_GROUP_PROFILE": "Profil & Apparence",
   "LABEL_SETTINGS_GROUP_PROFILE_TOOLTIP": "Modifiez votre nom d'utilisateur, votre thème et vos préférences linguistiques.",
   "LABEL_SETTINGS_GROUP_SYNC": "Lecture & Sync",
-  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Personnalisez la lecture, les notifications et les préférences audio."
+  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Personnalisez la lecture, les notifications et les préférences audio.",
+  "CHAT_TITLE": "Chat du salon",
+  "CHAT_LIVE_ONLY": "En direct uniquement. Aucun historique.",
+  "CHAT_OPEN": "Ouvrir le chat du salon",
+  "CHAT_CLOSE": "Fermer le chat",
+  "CHAT_DOCK_LEFT": "Ancrer le chat à gauche",
+  "CHAT_DOCK_RIGHT": "Ancrer le chat à droite",
+  "CHAT_DETACHED": "Détacher le chat",
+  "CHAT_PLACEHOLDER": "Écrire un message...",
+  "CHAT_SEND": "Envoyer",
+  "CHAT_MISSING_KEY": "Le chat est disponible uniquement via un lien d'invitation actuel.",
+  "CHAT_TOO_LONG": "500 caractères maximum.",
+  "CHAT_SEND_FAILED": "Le message n'a pas pu être envoyé.",
+  "CHAT_EMPTY": "Aucun message. Le chat est uniquement en direct."
 }
diff --git a/extension/locales/it.json b/extension/locales/it.json
index bb72c95..fec5034 100644
--- a/extension/locales/it.json
+++ b/extension/locales/it.json
@@ -243,5 +243,18 @@
   "LABEL_SETTINGS_GROUP_PROFILE": "Profilo & Aspetto",
   "LABEL_SETTINGS_GROUP_PROFILE_TOOLTIP": "Modifica il tuo nome utente, tema e preferenze di lingua.",
   "LABEL_SETTINGS_GROUP_SYNC": "Riproduzione & Sync",
-  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Personalizza la riproduzione, le notifiche e le preferenze audio."
+  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Personalizza la riproduzione, le notifiche e le preferenze audio.",
+  "CHAT_TITLE": "Chat della stanza",
+  "CHAT_LIVE_ONLY": "Solo in diretta. Nessuna cronologia.",
+  "CHAT_OPEN": "Apri la chat della stanza",
+  "CHAT_CLOSE": "Chiudi chat",
+  "CHAT_DOCK_LEFT": "Aggancia chat a sinistra",
+  "CHAT_DOCK_RIGHT": "Aggancia chat a destra",
+  "CHAT_DETACHED": "Sgancia chat",
+  "CHAT_PLACEHOLDER": "Scrivi un messaggio...",
+  "CHAT_SEND": "Invia",
+  "CHAT_MISSING_KEY": "La chat è disponibile solo tramite un link di invito attuale.",
+  "CHAT_TOO_LONG": "Massimo 500 caratteri.",
+  "CHAT_SEND_FAILED": "Impossibile inviare il messaggio.",
+  "CHAT_EMPTY": "Nessun messaggio. La chat è solo in diretta."
 }
diff --git a/extension/locales/ja.json b/extension/locales/ja.json
index 70162a8..5c04171 100644
--- a/extension/locales/ja.json
+++ b/extension/locales/ja.json
@@ -243,5 +243,18 @@
   "LABEL_SETTINGS_GROUP_PROFILE": "プロフィールと外観",
   "LABEL_SETTINGS_GROUP_PROFILE_TOOLTIP": "ユーザー名、テーマ、言語設定を変更します。",
   "LABEL_SETTINGS_GROUP_SYNC": "再生と同期",
-  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "再生、通知、オーディオ設定をカスタマイズします。"
+  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "再生、通知、オーディオ設定をカスタマイズします。",
+  "CHAT_TITLE": "ルームチャット",
+  "CHAT_LIVE_ONLY": "ライブのみ。履歴はありません。",
+  "CHAT_OPEN": "ルームチャットを開く",
+  "CHAT_CLOSE": "チャットを閉じる",
+  "CHAT_DOCK_LEFT": "チャットを左に固定",
+  "CHAT_DOCK_RIGHT": "チャットを右に固定",
+  "CHAT_DETACHED": "チャットを切り離す",
+  "CHAT_PLACEHOLDER": "メッセージを入力...",
+  "CHAT_SEND": "送信",
+  "CHAT_MISSING_KEY": "チャットは最新の招待リンクからのみ利用できます。",
+  "CHAT_TOO_LONG": "最大500文字です。",
+  "CHAT_SEND_FAILED": "メッセージを送信できませんでした。",
+  "CHAT_EMPTY": "まだメッセージはありません。チャットはライブのみです。"
 }
diff --git a/extension/locales/ko.json b/extension/locales/ko.json
index d40a320..25721a2 100644
--- a/extension/locales/ko.json
+++ b/extension/locales/ko.json
@@ -243,5 +243,18 @@
   "LABEL_SETTINGS_GROUP_PROFILE": "프로필 및 테마",
   "LABEL_SETTINGS_GROUP_PROFILE_TOOLTIP": "사용자 이름, 테마 및 언어 설정을 변경합니다.",
   "LABEL_SETTINGS_GROUP_SYNC": "재생 및 동기화",
-  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "재생, 알림 및 오디오 설정을 맞춤설정합니다."
+  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "재생, 알림 및 오디오 설정을 맞춤설정합니다.",
+  "CHAT_TITLE": "방 채팅",
+  "CHAT_LIVE_ONLY": "실시간 전용. 기록 없음.",
+  "CHAT_OPEN": "방 채팅 열기",
+  "CHAT_CLOSE": "채팅 닫기",
+  "CHAT_DOCK_LEFT": "채팅을 왼쪽에 고정",
+  "CHAT_DOCK_RIGHT": "채팅을 오른쪽에 고정",
+  "CHAT_DETACHED": "채팅 분리",
+  "CHAT_PLACEHOLDER": "메시지를 입력하세요...",
+  "CHAT_SEND": "보내기",
+  "CHAT_MISSING_KEY": "채팅은 최신 초대 링크를 통해서만 사용할 수 있습니다.",
+  "CHAT_TOO_LONG": "최대 500자입니다.",
+  "CHAT_SEND_FAILED": "메시지를 보낼 수 없습니다.",
+  "CHAT_EMPTY": "아직 메시지가 없습니다. 채팅은 실시간 전용입니다."
 }
diff --git a/extension/locales/nl.json b/extension/locales/nl.json
index dd2a201..ef78f36 100644
--- a/extension/locales/nl.json
+++ b/extension/locales/nl.json
@@ -243,5 +243,18 @@
   "LABEL_SETTINGS_GROUP_PROFILE": "Profiel & Weergave",
   "LABEL_SETTINGS_GROUP_PROFILE_TOOLTIP": "Wijzig uw gebruikersnaam, thema en taalvoorkeuren.",
   "LABEL_SETTINGS_GROUP_SYNC": "Afspelen & Sync",
-  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Pas afspelen, meldingen en audiovoorkeuren aan."
+  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Pas afspelen, meldingen en audiovoorkeuren aan.",
+  "CHAT_TITLE": "Kamerchat",
+  "CHAT_LIVE_ONLY": "Alleen live. Geen geschiedenis.",
+  "CHAT_OPEN": "Kamerchat openen",
+  "CHAT_CLOSE": "Chat sluiten",
+  "CHAT_DOCK_LEFT": "Chat links vastzetten",
+  "CHAT_DOCK_RIGHT": "Chat rechts vastzetten",
+  "CHAT_DETACHED": "Chat losmaken",
+  "CHAT_PLACEHOLDER": "Schrijf een bericht...",
+  "CHAT_SEND": "Verzenden",
+  "CHAT_MISSING_KEY": "Chat is alleen beschikbaar via een actuele uitnodigingslink.",
+  "CHAT_TOO_LONG": "Maximaal 500 tekens.",
+  "CHAT_SEND_FAILED": "Bericht kon niet worden verzonden.",
+  "CHAT_EMPTY": "Nog geen berichten. Chat is alleen live."
 }
diff --git a/extension/locales/pl.json b/extension/locales/pl.json
index dde3e3d..2d6964d 100644
--- a/extension/locales/pl.json
+++ b/extension/locales/pl.json
@@ -243,5 +243,18 @@
   "LABEL_SETTINGS_GROUP_PROFILE": "Profil i Wygląd",
   "LABEL_SETTINGS_GROUP_PROFILE_TOOLTIP": "Zmień swoją nazwę użytkownika, motyw i preferencje językowe.",
   "LABEL_SETTINGS_GROUP_SYNC": "Odtwarzanie i Sync",
-  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Dostosuj odtwarzanie, powiadomienia i preferencje audio."
+  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Dostosuj odtwarzanie, powiadomienia i preferencje audio.",
+  "CHAT_TITLE": "Czat pokoju",
+  "CHAT_LIVE_ONLY": "Tylko na żywo. Bez historii.",
+  "CHAT_OPEN": "Otwórz czat pokoju",
+  "CHAT_CLOSE": "Zamknij czat",
+  "CHAT_DOCK_LEFT": "Przypnij czat po lewej",
+  "CHAT_DOCK_RIGHT": "Przypnij czat po prawej",
+  "CHAT_DETACHED": "Odłącz czat",
+  "CHAT_PLACEHOLDER": "Napisz wiadomość...",
+  "CHAT_SEND": "Wyślij",
+  "CHAT_MISSING_KEY": "Czat jest dostępny tylko przez aktualny link zaproszenia.",
+  "CHAT_TOO_LONG": "Maksymalnie 500 znaków.",
+  "CHAT_SEND_FAILED": "Nie udało się wysłać wiadomości.",
+  "CHAT_EMPTY": "Brak wiadomości. Czat działa tylko na żywo."
 }
diff --git a/extension/locales/pt-BR.json b/extension/locales/pt-BR.json
index 1d07782..9d75de4 100644
--- a/extension/locales/pt-BR.json
+++ b/extension/locales/pt-BR.json
@@ -243,5 +243,18 @@
   "LABEL_SETTINGS_GROUP_PROFILE": "Perfil e Aparência",
   "LABEL_SETTINGS_GROUP_PROFILE_TOOLTIP": "Altere o seu nome de usuário, tema e preferências de idioma.",
   "LABEL_SETTINGS_GROUP_SYNC": "Reprodução e Sincronização",
-  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Personalize a reprodução, as notificações e as preferências de áudio."
+  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Personalize a reprodução, as notificações e as preferências de áudio.",
+  "CHAT_TITLE": "Chat da sala",
+  "CHAT_LIVE_ONLY": "Somente ao vivo. Sem histórico.",
+  "CHAT_OPEN": "Abrir chat da sala",
+  "CHAT_CLOSE": "Fechar chat",
+  "CHAT_DOCK_LEFT": "Fixar chat à esquerda",
+  "CHAT_DOCK_RIGHT": "Fixar chat à direita",
+  "CHAT_DETACHED": "Desanexar chat",
+  "CHAT_PLACEHOLDER": "Escreva uma mensagem...",
+  "CHAT_SEND": "Enviar",
+  "CHAT_MISSING_KEY": "O chat está disponível apenas por um link de convite atual.",
+  "CHAT_TOO_LONG": "Máximo de 500 caracteres.",
+  "CHAT_SEND_FAILED": "Não foi possível enviar a mensagem.",
+  "CHAT_EMPTY": "Ainda não há mensagens. O chat é somente ao vivo."
 }
diff --git a/extension/locales/pt.json b/extension/locales/pt.json
index b360401..3bc3b91 100644
--- a/extension/locales/pt.json
+++ b/extension/locales/pt.json
@@ -243,5 +243,18 @@
   "LABEL_SETTINGS_GROUP_PROFILE": "Perfil e Aparência",
   "LABEL_SETTINGS_GROUP_PROFILE_TOOLTIP": "Altere o seu nome de utilizador, tema e preferências de idioma.",
   "LABEL_SETTINGS_GROUP_SYNC": "Reprodução e Sincronização",
-  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Personalize a reprodução, as notificações e as preferências de áudio."
+  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Personalize a reprodução, as notificações e as preferências de áudio.",
+  "CHAT_TITLE": "Chat da sala",
+  "CHAT_LIVE_ONLY": "Apenas em direto. Sem histórico.",
+  "CHAT_OPEN": "Abrir chat da sala",
+  "CHAT_CLOSE": "Fechar chat",
+  "CHAT_DOCK_LEFT": "Fixar chat à esquerda",
+  "CHAT_DOCK_RIGHT": "Fixar chat à direita",
+  "CHAT_DETACHED": "Desanexar chat",
+  "CHAT_PLACEHOLDER": "Escreva uma mensagem...",
+  "CHAT_SEND": "Enviar",
+  "CHAT_MISSING_KEY": "O chat está disponível apenas através de um link de convite atual.",
+  "CHAT_TOO_LONG": "Máximo de 500 caracteres.",
+  "CHAT_SEND_FAILED": "Não foi possível enviar a mensagem.",
+  "CHAT_EMPTY": "Ainda não há mensagens. O chat funciona apenas em direto."
 }
diff --git a/extension/locales/ru.json b/extension/locales/ru.json
index 7aa0e35..b43dca0 100644
--- a/extension/locales/ru.json
+++ b/extension/locales/ru.json
@@ -243,5 +243,18 @@
   "LABEL_SETTINGS_GROUP_PROFILE": "Профиль и Оформление",
   "LABEL_SETTINGS_GROUP_PROFILE_TOOLTIP": "Измените имя пользователя, тему и настройки языка.",
   "LABEL_SETTINGS_GROUP_SYNC": "Воспроизведение и Синхронизация",
-  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Настройте воспроизведение, уведомления и параметры звука."
+  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Настройте воспроизведение, уведомления и параметры звука.",
+  "CHAT_TITLE": "Чат комнаты",
+  "CHAT_LIVE_ONLY": "Только в реальном времени. Без истории.",
+  "CHAT_OPEN": "Открыть чат комнаты",
+  "CHAT_CLOSE": "Закрыть чат",
+  "CHAT_DOCK_LEFT": "Закрепить чат слева",
+  "CHAT_DOCK_RIGHT": "Закрепить чат справа",
+  "CHAT_DETACHED": "Открепить чат",
+  "CHAT_PLACEHOLDER": "Напишите сообщение...",
+  "CHAT_SEND": "Отправить",
+  "CHAT_MISSING_KEY": "Чат доступен только по актуальной ссылке-приглашению.",
+  "CHAT_TOO_LONG": "Не более 500 символов.",
+  "CHAT_SEND_FAILED": "Не удалось отправить сообщение.",
+  "CHAT_EMPTY": "Сообщений пока нет. Чат работает только в реальном времени."
 }
diff --git a/extension/locales/tr.json b/extension/locales/tr.json
index b5b29da..f00a1b6 100644
--- a/extension/locales/tr.json
+++ b/extension/locales/tr.json
@@ -243,5 +243,18 @@
   "LABEL_SETTINGS_GROUP_PROFILE": "Profil ve Görünüm",
   "LABEL_SETTINGS_GROUP_PROFILE_TOOLTIP": "Kullanıcı adınızı, temanızı ve dil tercihlerinizi değiştirin.",
   "LABEL_SETTINGS_GROUP_SYNC": "Oynatma ve Eşitleme",
-  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Oynatma, bildirim ve ses tercihlerini özelleştirin."
+  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Oynatma, bildirim ve ses tercihlerini özelleştirin.",
+  "CHAT_TITLE": "Oda Sohbeti",
+  "CHAT_LIVE_ONLY": "Yalnızca canlı. Geçmiş yok.",
+  "CHAT_OPEN": "Oda sohbetini aç",
+  "CHAT_CLOSE": "Sohbeti kapat",
+  "CHAT_DOCK_LEFT": "Sohbeti sola sabitle",
+  "CHAT_DOCK_RIGHT": "Sohbeti sağa sabitle",
+  "CHAT_DETACHED": "Sohbeti ayır",
+  "CHAT_PLACEHOLDER": "Bir mesaj yazın...",
+  "CHAT_SEND": "Gönder",
+  "CHAT_MISSING_KEY": "Sohbet yalnızca güncel bir davet bağlantısıyla kullanılabilir.",
+  "CHAT_TOO_LONG": "En fazla 500 karakter.",
+  "CHAT_SEND_FAILED": "Mesaj gönderilemedi.",
+  "CHAT_EMPTY": "Henüz mesaj yok. Sohbet yalnızca canlıdır."
 }
diff --git a/extension/locales/uk.json b/extension/locales/uk.json
index 22aa7d5..13dbbdb 100644
--- a/extension/locales/uk.json
+++ b/extension/locales/uk.json
@@ -243,5 +243,18 @@
   "LABEL_SETTINGS_GROUP_PROFILE": "Профіль та Вигляд",
   "LABEL_SETTINGS_GROUP_PROFILE_TOOLTIP": "Змініть ім'я користувача, тему та мовні налаштування.",
   "LABEL_SETTINGS_GROUP_SYNC": "Відтворення та Синхронізація",
-  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Налаштуйте відтворення, сповіщення та параметри звуку."
+  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "Налаштуйте відтворення, сповіщення та параметри звуку.",
+  "CHAT_TITLE": "Чат кімнати",
+  "CHAT_LIVE_ONLY": "Лише наживо. Без історії.",
+  "CHAT_OPEN": "Відкрити чат кімнати",
+  "CHAT_CLOSE": "Закрити чат",
+  "CHAT_DOCK_LEFT": "Закріпити чат ліворуч",
+  "CHAT_DOCK_RIGHT": "Закріпити чат праворуч",
+  "CHAT_DETACHED": "Від'єднати чат",
+  "CHAT_PLACEHOLDER": "Напишіть повідомлення...",
+  "CHAT_SEND": "Надіслати",
+  "CHAT_MISSING_KEY": "Чат доступний лише за актуальним посиланням-запрошенням.",
+  "CHAT_TOO_LONG": "Не більше 500 символів.",
+  "CHAT_SEND_FAILED": "Не вдалося надіслати повідомлення.",
+  "CHAT_EMPTY": "Повідомлень ще немає. Чат працює лише наживо."
 }
diff --git a/extension/locales/zh.json b/extension/locales/zh.json
index dda1b53..311bb0d 100644
--- a/extension/locales/zh.json
+++ b/extension/locales/zh.json
@@ -243,5 +243,18 @@
   "LABEL_SETTINGS_GROUP_PROFILE": "个人资料与外观",
   "LABEL_SETTINGS_GROUP_PROFILE_TOOLTIP": "更改您的用户名、主题和语言首选项。",
   "LABEL_SETTINGS_GROUP_SYNC": "播放与同步",
-  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "自定义播放、通知和音频首选项。"
+  "LABEL_SETTINGS_GROUP_SYNC_TOOLTIP": "自定义播放、通知和音频首选项。",
+  "CHAT_TITLE": "房间聊天",
+  "CHAT_LIVE_ONLY": "仅实时显示，无历史记录。",
+  "CHAT_OPEN": "打开房间聊天",
+  "CHAT_CLOSE": "关闭聊天",
+  "CHAT_DOCK_LEFT": "将聊天固定在左侧",
+  "CHAT_DOCK_RIGHT": "将聊天固定在右侧",
+  "CHAT_DETACHED": "浮动聊天",
+  "CHAT_PLACEHOLDER": "输入消息...",
+  "CHAT_SEND": "发送",
+  "CHAT_MISSING_KEY": "聊天仅可通过当前邀请链接使用。",
+  "CHAT_TOO_LONG": "最多500个字符。",
+  "CHAT_SEND_FAILED": "无法发送消息。",
+  "CHAT_EMPTY": "暂无消息。聊天仅实时显示。"
 }