# ContainSite

> Per-container fingerprint isolation — each container gets its own unique device identity

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

## Overview

- **ID:** `containsite`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** salmutt
- **Category:** privacy-security,tabs
- **Daily users:** 1
- **Rating:** 5.00 / 5 (1 ratings)
- **Version:** 0.7.0
- **Last updated:** 2026-04-08
- **First published:** 2026-03-01
- **Size:** 64 KB
- **Data as of:** 2026-09-09
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/containsite/)
- **Website:** [https://github.com/SalMutt/ContainSite](https://github.com/SalMutt/ContainSite)

## Description

Every website you visit is automatically placed in its own isolated container with a unique, deterministic device fingerprint. Sites cannot share sessions, cookies, or correlate you through browser fingerprinting.

Features:
- Automatic per-site containers — no configuration needed
- 20 spoofed fingerprint vectors: Canvas, WebGL, AudioContext, Navigator, Screen, Timezone, WebRTC, Fonts, Font API, ClientRects, Plugins, Battery, Connection, HTTP Headers, Speech Synthesis, matchMedia, Performance Timing, Storage Estimate, Gamepad, import/export
- HTTP header spoofing — User-Agent, Accept-Language, and Client Hints per container
- Cloudflare-safe mode — per-container shield toggle that disables vectors causing bot detection (UA, platform, WebGL, screen) while keeping undetectable vectors active (canvas, audio, fonts, timezone)
- Auth-aware — login redirects stay in the originating container
- Preserve original tab — cross-domain link clicks open a new container tab, keeping your current page open
- Options page to toggle individual vectors, whitelist domains, auto-prune inactive containers, and manage containers
- Per-container vector overrides — fine-tune spoofing for individual sites
- Import/export all settings

Works alongside Firefox Multi-Account Containers. No external dependencies. Zero data collection.

## Rankings

- #84,899 — Overall
- #159 — contain

## Permissions and access

### Permissions

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

## Safety

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

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- 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/containsite)