# MSync

> Extension to load MChat hosted subtitles or to help create subtitle for streams from various platforms.

Canonical page: [https://chrome-stats.com/d/msync](https://chrome-stats.com/d/msync)

## Overview

- **ID:** `msync`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** MonMon Mnemonic
- **Category:** other
- **Daily users:** 1
- **Version:** 4.0.0
- **Last updated:** 2021-12-23
- **First published:** 2021-01-07
- **Size:** 235 KB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/msync/)
- **Website:** [https://mchatx.org/](https://mchatx.org/)

## Description

MSync is an extension for Firefox that helps you synchronize the video player and live chat on different streaming platforms using the MChat app. It allows you to filter live chat, send data to display in the app, synchronize archive viewer and video replay time, and send customized live chat straight from the app.

## Rankings

- #126,236 — Overall
- #231 — sync

## Permissions and access

### Permissions

- `*://www.youtube.com/*`
- `*://twitcasting.tv/*`
- `*://*.twitcasting.tv/*`
- `*://www.twitch.tv/videos/*`
- `*://www.twitch.tv/*`
- `*://live.bilibili.com/*`
- `*://www.bilibili.com/video/*`
- `*://www.nicovideo.jp/watch/*`
- `*://live2.nicovideo.jp/watch/*`
- `*://live.nicovideo.jp/watch/*`
- `https://repo.mchatx.org/`

### Content script matches

- `www.youtube.com`
- `www.twitch.tv`
- `live.bilibili.com`
- `www.bilibili.com`
- `player.bilibili.com`
- `www.nicovideo.jp`
- `embed.nicovideo.jp`
- `live2.nicovideo.jp`
- `live.nicovideo.jp`
- `twitcasting.tv`
- `*.twitcasting.tv`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Request access to the following domains: youtube.com, twitcasting.tv, twitch.tv, bilibili.com, nicovideo.jp, mchatx.org
- This extension website URL may be invalid

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Similar extensions and apps

- [Watch Party Sync](https://chrome-stats.com/d/watch-party-sync)
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- [Sync View](https://chrome-stats.com/d/sync-view) — 1 users
- [Sync Watch](https://chrome-stats.com/d/sync-watch) — 1 users
- [SyncUp](https://chrome-stats.com/d/syncup) — 165 users
- [MiniSync](https://chrome-stats.com/d/minisync)
- [StreamSync Chat](https://chrome-stats.com/d/streamsync-chat)
- [Video Sync Space for Youtube](https://chrome-stats.com/d/video-sync-space) — 2 users, 5.00 / 5
- [Message Syncer](https://chrome-stats.com/d/message-syncer)
- [Synclify](https://chrome-stats.com/d/synclify) — 296 users, 5.00 / 5
- [Multi-Stream Chat Monitor](https://chrome-stats.com/d/multi-stream-chat-monitor) — 2 users
- [CommentSync - Real-time YouTube Comments](https://chrome-stats.com/d/commentsync) — 36 users, 3.00 / 5

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Source: [Chrome-Stats](https://chrome-stats.com/d/msync)