uBO-Scope

Name: uBO-Scope
Rating: 4.7582 (91 reviews)
Author: Raymond Hill

By: Raymond Hill

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

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Install

Features & Capabilities

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.

User Growth & Download Statistics

Add-on Privacy & Security Developer Tools

By:

Daily users:

Rating:

Version:

1.5.0 Last updated: 2025-12-23

Version code:

6105432

Creation date:

2017-08-25

Risk:

Permissions:

Host permissions:

https://*/*
http://*/*
wss://*/*
ws://*/*

Size:

482.39KB

URLs:

Website ,Privacy policy

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-21

Compare stats and ranking:

Ranking

# 3,754 ▲ 22

Other rankings

#23 in score keyword 21 ▲ 1

#54 in party keyword 39 ▲ 1

#123 in scrape keyword 54 ▲ 3

#141 in open ai keyword 53 ▲ 2

#142 in bot keyword 17

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Other platforms

uBlock Origin Scope (v1.5.0)

50,000 4.23

(48)

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Raymond Hill

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/ubo-scope/

Website:

https://github.com/gorhill/uBO-Scope

Permission Change History

2025-12-08: Version 1.2.0 → 1.3.0

Add Permissions: scripting

2025-10-15: Version 1.0.2 → 1.1.0

Add Permissions: webNavigation

2025-08-22: Version 0.1.13resigned1 → 1.0.1

Add Host permissions: https://*/* http://*/* wss://*/* ws://*/*

Add Permissions: activeTab

Remove Permissions: alarms unlimitedStorage <all_urls>

User Reviews

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

Cons

Recent reviews

by Me*****, 2026-05-20

by Cr*****, 2026-02-19

by su*****, 2025-11-14

View all user reviews ›

Is uBO-Scope Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

uBO-Scope requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

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

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

uBO-Scope is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
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