# LinkCage

> Extension alone won't work. Needs Docker + the LinkCage companion host. Risky links open in a sandbox. More: linkcage.app

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

## Overview

- **ID:** `linkcage`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Luis Yax
- **Category:** privacy-security
- **Version:** 1.0.0
- **Last updated:** 2026-06-05
- **First published:** 2026-06-02
- **Size:** 55 KB
- **Data as of:** 2026-09-12
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/linkcage/)
- **Website:** [https://linkcage.app](https://linkcage.app/)

## Description

LinkCage opens links you don't trust inside a throwaway, isolated browser - on your own computer - so nothing dangerous touches your real browser.

REQUIREMENTS (read before installing)
This add-on is one part of a three-part tool. It needs:
- Docker Desktop, installed and running, and
- The free, open-source LinkCage companion host (one-time install).
The add-on is only the trigger. Without Docker and the host it cannot launch a sandbox. Setup: https://linkcage.app

HOW IT WORKS
Right-click an untrusted link and choose "Open in LinkCage." The URL is handed, via native messaging, to the local companion host, which spins up a disposable Chromium browser inside an isolated Docker container. Malicious content stays in that container - never reaching Firefox, your files, or your credentials. Close it and the container is destroyed (RAM-only).

Before the page loads, the host checks the link against URLhaus and Google Safe Browsing and shows a SAFE / SUSPICIOUS / MALICIOUS splash.

PRIVACY
- No LinkCage cloud service; the add-on sends nothing to us.
- The add-on transmits the clicked URL only to the local companion host, over native messaging.
- The host performs the reputation lookup directly against URLhaus and Google Safe Browsing. In-sandbox browsing is not logged or transmitted.
- Open-source and auditable.

WHAT IT IS NOT
Not antivirus. It does not monitor or filter normal Firefox browsing. It isolates only the links you choose to cage.

Source & install: https://linkcage.app

## Rankings

- #136,773 — Overall
- #50 — antivirus

## Permissions and access

### Permissions

- `contextMenus`
- `nativeMessaging`
- `notifications`

## Safety

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

### Analysis details

- Facilitates communication between extensions and native applications, usually low risk if managed correctly.
- 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/linkcage)