diff --git a/CHANGELOG.md b/CHANGELOG.md
index 60728d8..a3992dd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,23 @@ This project follows [Semantic Versioning](https://semver.org/).
---
+## v4.6.0 - 2026-02-22
+
+### Fixed
+- **Fire TV / Silk Browser – screen saver prevention (wakelock.js)**
+ - Fixed a bug where the NoSleep canvas-stream video was paused by the browser
+ when the guide page was hidden (e.g. user switched to another Fire TV app)
+ but never resumed when the page became visible again, silently disabling
+ screen-saver prevention for the rest of the session.
+ - Fixed a race condition in the Screen Wake Lock API path where the sentinel's
+ `release` event could fire *after* the page-visible `visibilitychange` event,
+ leaving the lock unreleased with nothing to re-acquire it.
+ - The `visibilitychange` handler now: resumes a paused NoSleep video immediately,
+ re-requests the Wake Lock when the sentinel is gone, and pro-actively refreshes
+ an existing sentinel to win any release-event race.
+
+---
+
## v4.5.0 - 2026-02-15
### Added
diff --git a/static/js/wakelock.js b/static/js/wakelock.js
new file mode 100644
index 0000000..45edd53
--- /dev/null
+++ b/static/js/wakelock.js
@@ -0,0 +1,130 @@
+/**
+ * wakelock.js – Prevent the screen saver from appearing on Fire TV (Silk Browser)
+ * and other TV/mobile platforms while the guide page is active and no full-screen
+ * video is playing.
+ *
+ * Strategy:
+ * 1. Try the Screen Wake Lock API (available in Chromium 84+ / modern Silk).
+ * 2. Fall back to an invisible 1×1 canvas-stream video element (the classic
+ * "NoSleep" trick) which also works on Silk / Fire TV and any other
+ * Chromium-based browser that supports captureStream().
+ *
+ * The lock is acquired on page load and re-acquired whenever the page becomes
+ * visible again (e.g. after the user switches back from another Fire TV app).
+ * Special care is taken to resume the NoSleep video if the browser paused it
+ * while the page was hidden, and to handle the race between the Wake Lock
+ * sentinel's release event and the visibilitychange event.
+ */
+(function () {
+ 'use strict';
+
+ var wakeLockSentinel = null;
+ var noSleepVideo = null;
+
+ // ---------------------------------------------------------------------------
+ // Wake Lock API path
+ // ---------------------------------------------------------------------------
+ function requestWakeLock() {
+ if (!('wakeLock' in navigator)) {
+ startNoSleepVideo();
+ return;
+ }
+ navigator.wakeLock.request('screen').then(function (sentinel) {
+ wakeLockSentinel = sentinel;
+ sentinel.addEventListener('release', function () {
+ wakeLockSentinel = null;
+ });
+ }).catch(function () {
+ // Permission denied or API failed; use the video fallback instead.
+ startNoSleepVideo();
+ });
+ }
+
+ // ---------------------------------------------------------------------------
+ // NoSleep video fallback (canvas-stream, no external file needed)
+ // ---------------------------------------------------------------------------
+ function startNoSleepVideo() {
+ if (noSleepVideo) return; // already running
+
+ var canvas = document.createElement('canvas');
+ canvas.width = 1;
+ canvas.height = 1;
+
+ var video = document.createElement('video');
+ video.setAttribute('muted', '');
+ video.setAttribute('playsinline', '');
+ video.setAttribute('loop', '');
+ video.style.cssText =
+ 'position:fixed;top:-2px;left:-2px;width:1px;height:1px;' +
+ 'opacity:0;pointer-events:none;z-index:-1;';
+
+ // captureStream is available in Chromium (including Silk) and Firefox.
+ if (typeof canvas.captureStream === 'function') {
+ video.srcObject = canvas.captureStream(1);
+ } else {
+ // No captureStream support; nothing more we can do silently.
+ return;
+ }
+
+ document.body.appendChild(video);
+ noSleepVideo = video;
+
+ video.play().catch(function () {
+ // Autoplay was blocked (requires user gesture on some platforms).
+ // Wire up a one-shot user-interaction handler to start it on first input.
+ function onUserGesture() {
+ // Subsequent failures are silently ignored; the video is best-effort.
+ video.play().catch(function () {});
+ document.removeEventListener('click', onUserGesture, true);
+ document.removeEventListener('keydown', onUserGesture, true);
+ document.removeEventListener('touchstart', onUserGesture, true);
+ }
+ document.addEventListener('click', onUserGesture, true);
+ document.addEventListener('keydown', onUserGesture, true);
+ document.addEventListener('touchstart', onUserGesture, true);
+ });
+ }
+
+ // ---------------------------------------------------------------------------
+ // Re-acquire when the page becomes visible again
+ // ---------------------------------------------------------------------------
+ document.addEventListener('visibilitychange', function () {
+ if (document.visibilityState !== 'visible') return;
+
+ if (noSleepVideo) {
+ // The browser pauses media elements while the page is hidden.
+ // Resume the canvas-stream video so screen-saver prevention stays active.
+ if (noSleepVideo.paused) {
+ noSleepVideo.play().catch(function () {});
+ }
+ } else if (!wakeLockSentinel) {
+ // Wake Lock was released while hidden (or never acquired); re-acquire now.
+ // This also covers the race where the sentinel's release event fires just
+ // after the visibilitychange event for the hidden state.
+ requestWakeLock();
+ } else {
+ // A sentinel exists but the browser may release it asynchronously right
+ // after this event; re-request now to stay ahead of that race.
+ navigator.wakeLock.request('screen').then(function (newSentinel) {
+ try { wakeLockSentinel.release(); } catch (e) {}
+ wakeLockSentinel = newSentinel;
+ newSentinel.addEventListener('release', function () {
+ wakeLockSentinel = null;
+ });
+ }).catch(function () {
+ // Wake Lock unavailable right now; fall back to the video strategy.
+ wakeLockSentinel = null;
+ startNoSleepVideo();
+ });
+ }
+ });
+
+ // ---------------------------------------------------------------------------
+ // Kick off on page load
+ // ---------------------------------------------------------------------------
+ if (document.readyState === 'loading') {
+ document.addEventListener('DOMContentLoaded', requestWakeLock);
+ } else {
+ requestWakeLock();
+ }
+})();
diff --git a/templates/guide.html b/templates/guide.html
index 08b7aa8..2ed1dca 100644
--- a/templates/guide.html
+++ b/templates/guide.html
@@ -569,6 +569,10 @@ Program Info
+
+
+