LagSync - Bluetooth Audio Fix

Name: LagSync - Bluetooth Audio Fix
Rating: 4.25 (4 reviews)
Author: Simon

Fix audio and video delay caused by Bluetooth latency. Sync your sound perfectly on YouTube, Netflix, and HTML5 video to get perfect lip-sync.

Overview

Firefox Add-ons Store

Daily users

112 ▲ 11

Data as of 2026-07-27

Rating:

4.25

(4)

Version:

1.2.1

Last updated: 2026-04-28

Features & Capabilities

Fix Bluetooth audio delay on YouTube, Netflix, and more. Adjust sync in real-time for perfect lip-sync with your headphones.

STOP THE LIP-SYNC FRUSTRATION

Bluetooth headphones often suffer from noticeable latency, causing the audio to fall out of sync with the video. LagSync is a technical tool designed to fix this by letting you adjust the audio or video offset in real-time.

While optimized for YouTube and Netflix, LagSync is built to work on almost all standard HTML5 video players to ensure a perfectly synchronized viewing experience.

MAIN FEATURES

Real-time Sync: Shift the audio offset instantly without refreshing the page or re-buffering.
Broad Compatibility: Specialized hooks for major streaming platforms and universal support for HTML5 video.
Precision Control: Fine-tune the delay in milliseconds (ms) for exact synchronization.
Performance Focused: Minimal code footprint that won't slow down your tabs or drain your battery.

HOW IT WORKS

Open a video in your Firefox browser.
Click the LagSync icon in your toolbar.
Adjust the slider or input a specific millisecond value until the sync is perfect.

PRIVACY FIRST

Firefox users value their data, and so do we.

Zero Tracking: We do not collect, store, or transmit your browsing history or video data.
Local Storage: All your settings and offsets stay locally in your browser.
No Ads: LagSync is a utility tool, not an ad-delivery platform.

SUPPORT THE PROJECT

LagSync is a passion project. If it saved your movie night, consider supporting the development here: Support LagSync

WHY LAGSYNC?

Most web players lack built-in tools for audio delay compensation. LagSync provides a straightforward, manual solution for users who want their media to match their audio perfectly—no matter what headphones they are using.

User Growth & Download Statistics

Add-on

By:

Simon

Daily users:

112 11

Rating:

4.25

(4)

Version:

1.2.1 Last updated: 2026-04-28

Version code:

6239205

Creation date:

2026-04-04

Risk:

Permissions:

Host permissions:

http://*/*
https://*/*

Content scripts matches:

Size:

103.53KB

Email:

su*****@lagsync.com

URLs:

Website ,Privacy policy

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-07-27

Compare stats and ranking:

Ranking

# 10,730 ▲ 497

Other rankings

#33 in sync keyword 38 ▲ 2#63 in audio keyword 36 ▲ 1#77 in cause keyword 25 #99 in udio keyword 7 ▲ 2#223 in netflix keyword 49 ▲ 1

Other platforms

LagSync - Bluetooth Audio Fix (v1.2.2)

1,000 4.75

(8)

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Simon

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/lagsync-bluetooth-audio-fix/

Email:

su*****@lagsync.com

Website:

https://lagsync.com/help

User Reviews

Unfortunately, it reduces YouTube video quality, affects the frame rate, and makes playback very unstable and unwatchable for me. I appreciate the effort, but I also have privacy concerns. Permissions should be limited to YouTube and any other websites selected by the user, rather than allowing access to all websites.

by Gr*****, 2026-07-12

Super praktisch - bei mir funktioniert das gut zusammen mit einem Marshall Emberton III

by Di*****, 2026-05-28

View all user reviews ›

Is LagSync - Bluetooth Audio Fix Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

LagSync - Bluetooth Audio Fix requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
Critical ****** ****** ** *** ********* ****** * *********** ******** **** ** ** *** ******* *** ****** **** **** *** ******* *****
High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****

Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

LagSync - Bluetooth Audio Fix is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
Medium **** ********* *** ******* ** *** **** * ******* *** ******* *** *** ** ****** ** *****
Medium **** ********* *** ***** ** *** **** * ******* *** ********** *** *** ** ****** ** *****
Good **** ********* *** **** **** *******