Firefox: Twitch and other live streams no longer look like ~12 fps with the delay on. The live-stream delay captures each frame and shows it again a moment later; Firefox copied every 1080p frame back to the CPU on the way, which took longer than a frame lasts. Frames now stay on the GPU. Measured on a 1080p60 Twitch stream: 10-13 distinct frames per second before, 53-60 after. If the GPU path is unavailable, LagSync falls back to the previous method automatically.

Fix: video players built from web components — BBC iPlayer and bbc.com among them — keep their video inside shadow DOM, where LagSync couldn't see it: the popup said "No video detected" even while a video was playing. LagSync now finds these videos, on every site.

Popup: when LagSync isn't allowed on the current site yet, the status line now says exactly that ("Not added yet — use Allow on this site") instead of leaving the impression that no video was found.

Maintenance release bringing Firefox in step with 1.4.0 on other browsers.

• No Firefox-specific behavior changes. The 1.3.1 playback-recovery hardening (fix for rare freezes/backward jumps at delay-change discontinuities) targets Chrome and Edge; Firefox's media engine already handles these discontinuities natively.
• The in-extension bug reporting introduced in 1.4.0 is currently Chrome/Edge-only and is not included in this Firefox build. Everything continues to run 100% on-device.

Playback fixes, most visible on Firefox:

• Fixed: regular videos (YouTube, Vimeo) no longer lose half their frame rate with added CPU load. They were mistakenly routed through the frame-capture path built for live streams; they now keep the native player untouched. Measured on the reported video: ~13 fps → full 30 fps.
• Fixed: Twitch live streams keep their delay on Firefox (live streams reporting an absurd "video length" were misdetected).
• Fixed: YouTube no longer freezes mid-video with a full buffer.
• Fixed: video quality no longer drops on YouTube/Vimeo when changing the delay.
• Privacy: LagSync now only asks for access to 19 known video sites instead of all websites; anything else is opt-in per site from Settings.
• Note: this update resets the "Max buffer" trim setting to off — it caused the quality drop above. You can re-enable it in Settings.

What's new in 1.2.1

Privacy
- New: "Turn off and pause usage stats" toggle in Settings → Privacy. Default is on. Stats are stored locally on this device only and are never sent anywhere.
- New: Turning the toggle off opens a confirmation with three options — Cancel, Pause only (keep existing stats), or Pause & delete (clear all stored stats).
- Improved: While paused, the Stats page hides all content and shows a "Resume usage stats" shortcut. Recording stops entirely — nothing accumulates.

Edge support (also benefits Firefox edge cases)
- Fixed: Delay now applies on all sites where some browser builds didn't reliably run "world: MAIN" content scripts at document_start. page_script.js is now also injected from the content script (with a double-init guard) so the hooks install on every build.
- Fixed: Twitch and other blob-backed live streams now use the frame-capture canvas pipeline consistently, matching Firefox behavior.

Sync engine and stability
- Fixed: Prime Video Instant mode now applies as a single hard jump instead of burst steps, which avoids the rebuffering stall while still being instant.
- Fixed: Twitch startup regression when LagSync was already enabled at page load. Worker/live-edge config is now refreshed automatically on startup, so delay applies without requiring a manual toggle.
- Fixed: Reduced startup stutter on Twitch by avoiding unnecessary WebAudio hooking in positive-delay mode.
- Improved: Instant increase mode uses safer near-instant burst behavior in no-trim contexts to reduce boundary-time stalls and rebuffering (except on Prime, see above).
- Improved: YouTube Instant mode uses near-instant burst stepping for a faster feel with better stability.
- Fixed: YouTube live streams that disable seeking backward (no-DVR live) now apply delay correctly via the canvas frame-capture pipeline, since MSE timestampOffset shifts would rebuffer against the pinned live edge.

Timing and controls
- Fixed: Toggling LagSync off now shows 0 ms immediately in the popup. Previously the popup kept displaying the last-applied delay (e.g. 180 ms) until it was closed and reopened, and as a side effect the next toggle-on skipped its countdown.
- Improved: Activation and deactivation now show a "Turning on/off in ~Xs" countdown driven by buffer-ahead, consistent with delay-change countdowns. Works with or without buffer trimming (useful on Prime and other no-trim sites).
- Fixed: "Starts adjusting" countdown estimation is more accurate on YouTube/VOD by limiting seekable fallback to trim-blocked contexts.
- Fixed: Speed and max-buffer settings now apply immediately on first click (no stale-value delay).

UI and versioning
- Improved: Popup version now comes automatically from the package version (including popup HTML title and popup footer).
- Fixed: Manifest version remains centralized in the build pipeline from the package version.

Changelog

All notable changes to this project will be documented in this file.

** 1.0.1 - 2026-04-07**

• Fix: keep Twitch/HUD visible by inserting delayed canvas sibling with z-index 0.
• Feature: capability-based pipeline selection (MSE vs canvas) instead of host hardcoding.
• Fix: Firefox Kick compatibility — added srcObject detection and rAF+createImageBitmap fallback.
• Fix: stabilize canvas pipeline to avoid black flashes and ensure setting changes apply reliably.
• Improvement: generalized "twitch" naming to a generic canvas/live-edge pipeline.
• Major Update: Refactored codebase to TypeScript for robust type-safety and reliability.
• Feature: Added compatibility for Prime Video.

Please see release notes in the UI for more details.