move version link outside h1 to avoid inherited heading styles

README.md

@@ -8,7 +8,7 @@
   <a href="https://chromewebstore.google.com/detail/koalasync/obbnmkmlaaddodakcbdljknjpagklifc"><img src="https://img.shields.io/badge/Chrome-Download-blue?logo=googlechrome&logoColor=white" alt="Chrome Extension"></a>
 </p>
 
-<p align="center"><i>KoalaSync is a lightweight Browser Extension and Relay Server for synchronized video playback across any website—YouTube, Twitch, Netflix, and custom HTML5 players. Built with a focus on <b>Data Sovereignty</b> and <b>Performance</b>.</i></p>
+<p align="center"><i>KoalaSync is a lightweight Browser Extension and Relay Server for synchronized video playback on almost any website with a video element—YouTube, Twitch, Netflix, Emby, Jellyfin, and beyond. Built with a focus on <b>Data Sovereignty</b> and <b>Performance</b>.</i></p>
 
 ### 🌟 Why KoalaSync?
 

extension/background.js

@@ -1167,6 +1167,15 @@ async function handleAsyncMessage(message, sender, sendResponse) {
                 }, FORCE_SYNC_TIMEOUT);
             }
             addToHistory(message.action, 'You');
+            
+            const isNonEssentialEvent = message.action === EVENTS.PLAY || message.action === EVENTS.PAUSE || message.action === EVENTS.SEEK;
+            const hasOtherPeers = currentRoom && Array.isArray(currentRoom.peers) && currentRoom.peers.length > 0;
+            
+            if (isNonEssentialEvent && !hasOtherPeers) {
+                sendResponse({ status: 'ok_solo' });
+                return;
+            }
+            
             emit(message.action, { ...message.payload, peerId });
             sendResponse({ status: 'ok' });
         };

extension/bridge.js

@@ -22,12 +22,15 @@ window.addEventListener('KOALASYNC_JOIN_REQUEST', (e) => {
 // 3. Listen for Status Updates from the Extension and relay to Website
 chrome.runtime.onMessage.addListener((msg) => {
     if (msg.type === 'JOIN_STATUS') {
-        const event = new CustomEvent('KOALASYNC_STATUS', { 
-            detail: { 
-                success: msg.success, 
-                message: msg.message 
-            } 
-        });
-        window.dispatchEvent(event);
+        const detail = { success: msg.success, message: msg.message };
+        // Firefox MV3 content scripts run in an isolated world. When dispatching
+        // a CustomEvent with a detail object, Firefox wraps it in an XrayWrapper
+        // that the page's JavaScript cannot destructure (Permission denied).
+        // cloneInto() exposes the object to the page's context correctly.
+        // Chrome doesn't have this issue — cloneInto() is undefined there.
+        const safeDetail = typeof cloneInto === 'function'
+            ? cloneInto(detail, document.defaultView)
+            : detail;
+        window.dispatchEvent(new CustomEvent('KOALASYNC_STATUS', { detail: safeDetail }));
     }
 });

extension/content.js

@@ -417,6 +417,10 @@
             }
             return;
         }
+
+        // Suppress only SEEK during visibility grace period (tab re-focus ghost jump).
+        // Play/Pause pass through — user may want to immediately pause after tabbing back.
+        if (Date.now() < visibilityGraceUntil && action === EVENTS.SEEK) return;
         
         chrome.runtime.sendMessage({
             type: 'CONTENT_EVENT',
@@ -433,6 +437,38 @@
         scheduleProactiveHeartbeat();
     }
 
+    // --- Tab Visibility Handling ---
+    // Browsers (especially Firefox) aggressively throttle background tabs.
+    // When the user returns to a video tab, the video element may have lost
+    // time-sync and fires spurious seek events as it recovers (jumping back).
+    // We suppress only SEEK for a short grace period after tab re-focus.
+    // Play/Pause are NOT suppressed — the user may legitimately want to
+    // pause immediately after switching back.
+    let pageVisible = !document.hidden;
+    let visibilityGraceUntil = 0;
+    const VISIBILITY_GRACE_MS = 1000;
+
+    document.addEventListener('visibilitychange', () => {
+        if (document.hidden) {
+            pageVisible = false;
+        } else if (!pageVisible) {
+            pageVisible = true;
+            visibilityGraceUntil = Date.now() + VISIBILITY_GRACE_MS;
+            reportLog(`Tab re-focused — suppressing seeks for ${VISIBILITY_GRACE_MS / 1000}s to prevent ghost relay`, 'warn');
+        }
+    });
+
+    // Reset on page hide/show (bfcache, tab discard)
+    window.addEventListener('pagehide', () => { pageVisible = false; });
+    window.addEventListener('pageshow', (event) => {
+        // event.persisted is true ONLY when restored from bfcache, not on initial load
+        if (event.persisted && !pageVisible) {
+            pageVisible = true;
+            visibilityGraceUntil = Date.now() + VISIBILITY_GRACE_MS;
+            reportLog(`Page restored from cache — suppressing seeks for ${VISIBILITY_GRACE_MS / 1000}s`, 'warn');
+        }
+    });
+
     const handlePlay = () => reportEvent(EVENTS.PLAY);
     const handlePause = () => reportEvent(EVENTS.PAUSE);
 
@@ -444,7 +480,7 @@
         const current = video.currentTime;
         if (!Number.isFinite(current)) return;
 
-        // Step 1: Check expectedEvents (programmatic seek suppression)
+        // Step 1: Check expectedEvents (programmatic seek from remote peer — ALWAYS process)
         if (expectedEvents.has('seek')) {
             expectedEvents.delete('seek');
             if (expectedTimeouts['seek']) {
@@ -452,20 +488,22 @@
                 delete expectedTimeouts['seek'];
             }
             lastReportedSeekTime = current;
-            // No log — this is routine programmatic behavior (Force Sync, lobby, peer command)
             return;
         }
 
+        // Step 2: Suppress during visibility grace period (tab re-focus ghost events)
+        if (Date.now() < visibilityGraceUntil) return;
+
         const delta = lastReportedSeekTime !== null ? Math.abs(current - lastReportedSeekTime) : null;
         const deltaStr = delta !== null ? `Δ${delta.toFixed(2)}s` : 'Δ?';
 
-        // Step 2: Delta check — skip micro-seeks (buffering, chapter markers, etc.)
+        // Step 3: Delta check — skip micro-seeks (buffering, chapter markers, etc.)
         if (lastReportedSeekTime !== null && delta < MIN_SEEK_DELTA) {
             reportLog(`[Seek] Filtered (${deltaStr} < ${MIN_SEEK_DELTA}s threshold) @ ${current.toFixed(2)}s — not relayed`, 'warn');
             return;
         }
 
-        // Step 3: Debounce rapid consecutive seeks (e.g. scrubbing)
+        // Step 4: Debounce rapid consecutive seeks (e.g. scrubbing)
         // — wait 800ms for the user to settle before relaying
         if (seekDebounceTimer) clearTimeout(seekDebounceTimer);
         seekDebounceTimer = setTimeout(() => {

extension/manifest.base.json

@@ -1,8 +1,8 @@
 {
   "manifest_version": 3,
   "name": "KoalaSync",
-  "version": "1.8.5",
-  "description": "Watch party extension to synchronize video playback on YouTube, Twitch, Netflix, and HTML5 sites in real-time with friends.",
+  "version": "1.8.8",
+  "description": "Watch party extension to synchronize video playback on YouTube, Twitch, Netflix, Emby, Jellyfin, and any HTML5 site in real-time with friends.",
   "permissions": [
     "storage",
     "tabs",

extension/popup.html

@@ -27,15 +27,20 @@
             font-size: 14px;
         }
 
+        .header-row {
+            display: flex;
+            align-items: center;
+            margin-bottom: 16px;
+        }
+
         h1 {
             font-size: 18px;
-            margin: 0 0 16px 0;
+            margin: 0;
             color: var(--accent);
             letter-spacing: 1px;
             text-transform: uppercase;
-            display: flex;
+            display: inline-flex;
             align-items: center;
-            justify-content: center;
             gap: 8px;
         }
 
@@ -46,6 +51,27 @@
             border-radius: 4px;
         }
 
+        .popup-version {
+            margin-left: auto;
+            display: flex;
+            align-items: center;
+            gap: 4px;
+            font-size: 10px;
+            color: var(--text-muted);
+            text-decoration: none;
+            opacity: 0.5;
+            transition: opacity 0.2s, color 0.2s;
+        }
+        .popup-version:hover {
+            opacity: 1;
+            color: var(--accent);
+        }
+        .popup-version svg {
+            width: 12px;
+            height: 12px;
+            display: block;
+        }
+
         /* Tabs */
         .tabs {
             display: flex;
@@ -288,7 +314,15 @@
 </head>
 <body>
     <div id="toast-container"></div>
-    <h1><img src="icons/icon128.png" alt="KoalaSync Logo">KoalaSync</h1>
+    <div class="header-row">
+                    <h1><img src="icons/icon128.png" alt="KoalaSync Logo">KoalaSync</h1>
+                    <a href="https://github.com/Shik3i/KoalaSync" target="_blank" class="popup-version">
+                        <svg viewBox="0 0 16 16" fill="currentColor">
+                            <path d="M8 0C3.58 0 0 3.58 0 8c0 3.54 2.29 6.53 5.47 7.59.4.07.55-.17.55-.38 0-.19-.01-.82-.01-1.49-2.01.37-2.53-.49-2.69-.94-.09-.23-.48-.94-.82-1.13-.28-.15-.68-.52-.01-.53.63-.01 1.08.58 1.23.82.72 1.21 1.87.87 2.33.66.07-.52.28-.87.51-1.07-1.78-.2-3.64-.89-3.64-3.95 0-.87.31-1.59.82-2.15-.08-.2-.36-1.02.08-2.12 0 0 .67-.21 2.2.82.64-.18 1.32-.27 2-.27.68 0 1.36.09 2 .27 1.53-1.04 2.2-.82 2.2-.82.44 1.1.16 1.92.08 2.12.51.56.82 1.27.82 2.15 0 3.07-1.87 3.75-3.65 3.95.29.25.54.73.54 1.48 0 1.07-.01 1.93-.01 2.2 0 .21.15.46.55.38A8.013 8.013 0 0016 8c0-4.42-3.58-8-8-8z"/>
+                        </svg>
+                        <span id="popupVersion">v0.0.0</span>
+                    </a>
+                </div>
 
     <div class="tabs">
         <button class="tab-btn active" data-tab="tab-room" title="Room settings and connection">Room</button>

extension/popup.js

@@ -105,10 +105,11 @@ async function init() {
     if (elements.autoCopyInvite) elements.autoCopyInvite.checked = data.autoCopyInvite !== false;
     
     // Set Version Info
+    const versionTxt = `v${chrome.runtime.getManifest().version}`;
     const versionEl = document.getElementById('appVersion');
-    if (versionEl) {
-        versionEl.textContent = `v${chrome.runtime.getManifest().version}`;
-    }
+    if (versionEl) versionEl.textContent = versionTxt;
+    const popupVerEl = document.getElementById('popupVersion');
+    if (popupVerEl) popupVerEl.textContent = versionTxt;
 
     if (data.useCustomServer) {
         setServerMode(true);

package.json

@@ -1,6 +1,6 @@
 {
   "name": "koalasync",
-  "version": "1.8.5",
+  "version": "1.8.8",
   "description": "KoalaSync Build Scripts",
   "private": true,
   "scripts": {

server/index.js

@@ -44,9 +44,10 @@ const httpServer = createServer(app);
 const io = new Server(httpServer, {
     cors: {
         origin: (origin, callback) => {
-            if (!origin || origin === 'https://sync.koalastuff.net' || origin.startsWith('chrome-extension://')) {
+            if (!origin || origin === 'https://sync.koalastuff.net' || origin.startsWith('chrome-extension://') || origin.startsWith('moz-extension://')) {
                 callback(null, true);
             } else {
+                log('CORS', `Rejected origin: ${origin}`);
                 callback(new Error('Not allowed by CORS'));
             }
         },
@@ -296,6 +297,7 @@ io.on('connection', (socket) => {
 
             const ip = socket._clientIp || socket.handshake.address;
             if (!checkAuthRate(ip, roomId)) {
+                log('AUTH', `Auth rate limit blocked ${ip} from room ${roomId.substring(0, 3)}***`);
                 socket.emit(EVENTS.ERROR, { message: "Too many failed attempts. Try again later." });
                 return;
             }
@@ -317,6 +319,7 @@ io.on('connection', (socket) => {
                     roomCreationLocks.set(roomId, lockPromise);
                     try {
                         if (rooms.size >= MAX_ROOMS) {
+                            log('ROOM', `Server at capacity: ${rooms.size}/${MAX_ROOMS} rooms — rejecting join`);
                             socket.emit(EVENTS.ERROR, { message: "Server capacity reached" });
                             return;
                         }
@@ -343,11 +346,13 @@ io.on('connection', (socket) => {
                 if (room.passwordHash) {
                     if (!password || !(await bcrypt.compare(password, room.passwordHash))) {
                         recordAuthFailure(ip, roomId);
+                        log('AUTH', `Invalid password from ${ip} for room ${roomId.substring(0, 3)}***`);
                         socket.emit(EVENTS.ERROR, { message: "Invalid password" });
                         return;
                     }
                 }
                 if (room.peers.size >= MAX_PEERS_PER_ROOM) {
+                    log('ROOM', `Room full (${room.peers.size}/${MAX_PEERS_PER_ROOM}): ${roomId.substring(0, 3)}***`);
                     socket.emit(EVENTS.ERROR, { message: "Room full" });
                     return;
                 }

shared/constants.js

@@ -7,7 +7,7 @@
  */
 
 export const PROTOCOL_VERSION = "1.0.0";
-export const APP_VERSION = "1.3.1";
+export const APP_VERSION = "1.8.6";
 
 export const OFFICIAL_SERVER_URL = 'wss://syncserver.koalastuff.net';
 export const OFFICIAL_LANDING_PAGE_URL = 'https://sync.koalastuff.net';

website/index.html

@@ -3,15 +3,18 @@
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>KoalaSync | Real-time Video Synchronization for Friends</title>
-    <meta name="description" content="Watch YouTube, Twitch, and HTML5 videos in sync with friends. KoalaSync is a privacy-first, open-source browser extension for Chrome and Firefox.">
+    <title>KoalaSync | Sync Netflix, Emby, Jellyfin & Any Video with Friends – Browser Extension</title>
+    <meta name="description" content="Watch Netflix, Emby, Jellyfin, YouTube, Twitch and any HTML5 video in perfect sync with friends. KoalaSync is a privacy-first, open-source browser extension for Chrome and Firefox. Works on almost any site with a video element.">
     
     <link rel="stylesheet" href="style.css">
     <link rel="icon" type="image/png" href="assets/logo.png">
-    <meta property="og:title" content="KoalaSync | Sync your videos">
-    <meta property="og:description" content="Watch together, stay in sync. Privacy-first video synchronization.">
+    <link rel="canonical" href="https://sync.koalastuff.net/">
+    <meta name="robots" content="index, follow">
+    <meta property="og:title" content="KoalaSync | Sync Netflix, Emby, Jellyfin & Any Video with Friends">
+    <meta property="og:description" content="Watch Netflix, Emby, Jellyfin, YouTube, Twitch and any HTML5 video in perfect sync. Privacy-first, open-source browser extension for Chrome & Firefox.">
     <meta property="og:image" content="https://sync.koalastuff.net/assets/logo.png">
     <meta property="og:type" content="website">
+    <meta property="og:url" content="https://sync.koalastuff.net/">
 
     <script src="lang-init.js"></script>
 </head>
@@ -100,7 +103,7 @@
                                 <div class="mock-label"><span lang="en">Invite Link</span><span lang="de">Einladungs-Link</span></div>
                                 <div class="mock-invite-box">
                                     <input type="text" class="mock-input" value="https://sync.koalastuff.net/join.html#join:brave-eagle-80:pass" readonly>
-                                    <button class="mock-btn" style="padding: 0.35rem 0.5rem;" onclick="navigator.clipboard.writeText('https://sync.koalastuff.net/join.html#join:brave-eagle-80:pass')"><span lang="en">Copy</span><span lang="de">Kopieren</span></button>
+                                    <button class="mock-btn" style="padding: 0.35rem 0.5rem;"><span lang="en">Copy</span><span lang="de">Kopieren</span></button>
                                 </div>
                             </div>
                             <div class="mock-card" style="margin-bottom: 12px;">
@@ -454,7 +457,7 @@
       <span class="t-key">-</span> <span class="t-str">MAX_PEERS_PER_ROOM=50</span>
     <span class="t-key">pids_limit:</span> <span class="t-val">2048</span></code></pre>
                         <div style="margin-top: 1rem; font-size: 0.75rem; text-align: right; padding-right: 0.5rem;">
-                            <a href="https://github.com/Shik3i/KoalaSync/pkgs/container/koalasync" target="_blank" style="color: var(--accent); text-decoration: none; display: inline-flex; align-items: center; gap: 6px; font-weight: 600; transition: opacity 0.2s; opacity: 0.85;" onmouseover="this.style.opacity='1'" onmouseout="this.style.opacity='0.85'">
+                            <a href="https://github.com/Shik3i/KoalaSync/pkgs/container/koalasync" target="_blank" style="color: var(--accent); text-decoration: none; display: inline-flex; align-items: center; gap: 6px; font-weight: 600; transition: opacity 0.2s; opacity: 0.85;">
                                 📦 <span lang="en">View all image tags on GitHub Packages</span><span lang="de">Alle Image-Tags auf GitHub Packages ansehen</span> →
                             </a>
                         </div>

website/robots.txt

@@ -1,4 +1,6 @@
+# KoalaSync Website — Allow all crawlers, full indexing
 User-agent: *
 Allow: /
 
+# Sitemap for search engines
 Sitemap: https://sync.koalastuff.net/sitemap.xml

website/version.json

@@ -1,4 +1,4 @@
 {
-  "version": "1.8.3",
-  "date": "2026-05-25T21:43:51Z"
+  "version": "1.8.8",
+  "date": "2026-05-26T00:34:04Z"
 }