# sync.js

> The easy way to transfer data.

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

## Overview

- **ID:** `sync-js`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** script.js
- **Category:** other
- **Daily users:** 1
- **Version:** 2.3
- **Last updated:** 2025-08-07
- **First published:** 2024-02-02
- **Size:** 14 KB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/sync-js/)

## Description

Backup and Restore localStorage data.

This extension does not work on some websites with complicated localStorage, such as Google.

## Rankings

- #108,535 — Overall
- #216 — sync

## Permissions and access

### Permissions

- `activeTab`

## Safety

- **Risk impact:** Very low risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- This extension has low user count. Unpopular extensions may not be stable or safe.

> 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

- [LocalSync](https://chrome-stats.com/d/local-sync)
- [State Mover](https://chrome-stats.com/d/state-mover)
- [State Shuttle](https://chrome-stats.com/d/state-shuttle)
- [Session & Local Storage Copier](https://chrome-stats.com/d/session-local-storage-copier) — 13 users
- [LocalStorage Tool](https://chrome-stats.com/d/localstorage-tool) — 8 users, 5.00 / 5
- [local-data-viewer](https://chrome-stats.com/d/local-data-viewer) — 1 users
- [Session Importer](https://chrome-stats.com/d/session-importer) — 17 users
- [Session Storage Tool](https://chrome-stats.com/d/session-storage-tool) — 1.00 / 5
- [LocalStorage Editor Mobile Material](https://chrome-stats.com/d/localstorage-editor-mobile) — 36 users, 5.00 / 5
- [Storage Explorer](https://chrome-stats.com/d/localstorage-explorer) — 45 users
- [Storage Explorer](https://chrome-stats.com/d/storage-explorer) — 45 users
- [Local Storage Manager](https://chrome-stats.com/d/localstorage-import-export) — 304 users, 4.67 / 5

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