Certificate Watch

Name: Certificate Watch
Rating: 5 (2 reviews)
Author: PilzAdam

By: PilzAdam

Warns when TLS certificates change over time.

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Features & Capabilities

Certificate Watch is a Chrome extension designed to enhance your online security by monitoring TLS certificates presented by websites. It stores the initial certificate of each visited domain and warns you if any subsequent changes occur, helping you detect potential security threats. The extension icon indicates whether a certificate is stored, new, or changed, allowing you to review and manage certificate updates easily.

This tool follows the Trust On First Use (TOFU) model by automatically trusting the first certificate it encounters per domain. It doesn't validate certificates—that's handled by your browser—but it alerts you to changes so you can make informed decisions. While it does not block connections, it serves as a valuable countermeasure against attacks involving compromised certificates, empowering you to stay aware of your connection security.

User Growth & Download Statistics

Add-on Privacy & Security

By:

Daily users:

Rating:

Version:

1.12.0 Last updated: 2019-12-01

Version code:

4914792

Creation date:

2019-08-12

Risk:

Permissions:

Size:

48.46KB

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-18

Compare stats and ranking:

Ranking

# 15,616 ▲ 396

Other rankings

#31 in watch keyword 23 ▲ 1

#113 in match keyword 22 ▼ 5

#184 in catalog keyword 7 ▲ 4

#186 in education keyword 10 ▲ 7

#194 in category keyword 23 ▲ 7

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For Developers

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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:

PilzAdam

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/certwatch/

Website:

https://github.com/PilzAdam/CertificateWatch/issues

User Reviews

by ig*****, 2023-09-05

View all user reviews ›

Is Certificate Watch 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.

Certificate Watch requires a few sensitive permissions. 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.
High ****** *** ********* ** ******* *** ******* ******* ** ****** *** *** ******** ******

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.

Certificate Watch has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

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