# CookieSync: syncs cookies to localhost

> This is an add-on which copies cookies to localhost. Target audience are developers that have code running on localhost which needs access to cookies set on other domains.

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

## Overview

- **ID:** `cookiesync`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Roel Noten
- **Category:** web-development,privacy-security
- **Daily users:** 16
- **Version:** 1.4
- **Last updated:** 2021-11-07
- **First published:** 2021-11-06
- **Size:** 60 KB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/cookiesync/)
- **Website:** [https://github.com/roelnoten/cookiesync](https://github.com/roelnoten/cookiesync)

## Description

CookieSync: Syncs cookies to localhost. This Firefox add-on copies incoming cookies from specified domains to the http://localhost domain. It is primarily used by developers who have code running on localhost and need access to cookies set on other domains.

## Rankings

- #27,453 — Overall
- #68 — sync
- #143 — cookie
- #208 — target

## Permissions and access

### Permissions

- `<all_urls>`
- `webRequest`
- `webRequestBlocking`
- `storage`
- `cookies`

## Safety

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

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- 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).

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