# Port Authority

> Blocks malicious websites from port-scanning your computer/network and dynamically blocks all LexisNexis endpoints from running their invasive data collection scripts.

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

## Overview

- **ID:** `port-authority`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Hacks and Hops
- **Category:** web-development,privacy-security
- **Daily users:** 26,717
- **Weekly downloads:** 1,526
- **Rating:** 4.65 / 5 (77 ratings)
- **Version:** 2.2.0
- **Last updated:** 2025-06-30
- **First published:** 2021-03-22
- **Size:** 52 KB
- **Data as of:** 2026-09-09
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/port-authority/)
- **Website:** [https://github.com/ACK-J/Port\_Authority](https://github.com/ACK-J/Port_Authority)

## Description

Port Authority is a free, open-source Chrome extension designed to protect users from malicious port scanning attacks and invasive tracking scripts, specifically those from LexisNexis ThreatMetrix. It dynamically blocks all types of port scanning (HTTP, HTTPS, WebSocket, FTP) and stops LexisNexis endpoints from running data collection scripts, safeguarding your networking privacy.

The extension is lightweight with approximately 200 lines of commented code, making it fully auditable. It features optional browser notifications for blocked threats and a whitelist to allow trusted domains. Port Authority respects privacy by not storing or transmitting user data. It includes testing tools, comprehensive permissions for effective functionality, and detailed documentation linking to its code repository and related reverse-engineering resources. Users wanting privacy from network-level invasive scripts and scans will find this extension valuable.

## Rankings

- #442 — Overall
- #13 — Web Development
- #24 — Privacy & Security
- #1 — author
- #1 — post
- #1 — sport

## Permissions and access

### Permissions

- `webRequest`
- `webRequestBlocking`
- `storage`
- `tabs`
- `notifications`
- `dns`
- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Very low 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 medium 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).

## Review summary

Overall, the reviews are positive: the add-on works as advertised, and users praise its network-protection features (notably alerting on local network scans and blocking LAN intrusion). It is considered feature-rich and more capable than comparable tools. However, some users report issues like performance impact, unclear exception configuration, and occasional compatibility problems in certain setups. The tone is enthusiastic, with many saying it does exactly what it promises and expressing surprise and approval at its capabilities.

### Pros

- Works as advertised and does what it promises.
- Blocks local network intrusion attempts and provides alerts when such activity is detected.
- Feature-rich and viewed as more capable than similar tools, with added functionality after updates.

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