# uBO-Scope

> A tool to measure your 3rd-party exposure score for web sites you visit.

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

## Overview

- **ID:** `ubo-scope`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Raymond Hill
- **Category:** privacy-security
- **Daily users:** 790
- **Weekly downloads:** 35
- **Rating:** 4.76 / 5 (92 ratings)
- **Version:** 1.5.0
- **Last updated:** 2025-12-23
- **First published:** 2017-08-25
- **Size:** 482 KB
- **Data as of:** 2026-09-11
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/ubo-scope/)
- **Website:** [https://github.com/gorhill/uBO-Scope](https://github.com/gorhill/uBO-Scope)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/ubo-scope/privacy/](https://addons.mozilla.org/firefox/addon/ubo-scope/privacy/)

## Description

uBO-Scope is a lightweight Chrome extension that reveals all connections — attempted or successful — between the pages you visit and remote servers. The toolbar badge reports the number of distinct third‑party remote servers contacted; a lower badge count indicates lower third‑party exposure. Not all third parties are harmful (CDNs and a few legit services are common), but a high count highlights broader tracking or dependency exposure.

The extension uses the browser `webRequest` API to log network requests and their outcomes, so it reports connections even when content is blocked by adblockers or DNS filters, provided the browser surfaces the requests through `webRequest`. Note the limitation: any network activity outside the reach of the `webRequest` API cannot be observed by uBO-Scope.

## Rankings

- #3,799 — Overall
- #27 — score
- #65 — party
- #145 — scrape
- #147 — open ai
- #160 — bot

## Permissions and access

### Permissions

- `activeTab`
- `scripting`
- `storage`
- `webNavigation`
- `webRequest`

### Host permissions

- `https://*/*`
- `http://*/*`
- `wss://*/*`
- `ws://*/*`

## Safety

- **Risk impact:** High 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).

## Review summary

Users overwhelmingly praise uBO-Scope, highlighting its strong recommendation and positive reception. Multiple reviewers note its focus on privacy and its ability to reveal website tracking. Several users also say it helps them learn how web tracking and privacy mechanisms work. No recurring complaints were mentioned across the reviews.

### Pros

- Strongly praised and highly recommended by multiple users
- Emphasizes privacy and exposes website tracking
- Helps users learn about the inner workings of web privacy and tracking

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