# Certificate Detector

> Detects and decodes certificates shown on a page.

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

## Overview

- **ID:** `certificate-detector`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Michael Lauwereys
- **Category:** search-tools
- **Daily users:** 19
- **Version:** 1.0
- **Last updated:** 2025-02-27
- **First published:** 2025-02-26
- **Size:** 113 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/certificate-detector/)

## Description

<strong>Certificate Detector</strong>

<strong>Description</strong>
The Certificate Detector is a browser extension that detects and decodes certificates displayed on web pages. It highlights the certificate text and provides detailed information about the certificate, including its validity, subject, issuer, and fingerprint.

<strong>Features</strong>
- Certificate Detection: Automatically scans web pages for certificates. You can add rules to scan on tags, ids or classes. It will also show certificates that are invalid or expired.
- Highlighting: Highlights detected certificates in the text fields and displays them in a user-friendly format. (can be disabled in options)
- Detailed Information: Provides information such as Certificate ID, Subject, Issuer, Validity Dates, and Fingerprint.
- Customizable Options: Users can configure display options, including which certificate details to show and the highlighting opacity.
- Import/Export Settings: Users can save their settings and import them later.

<strong>Configuration Options</strong>
- Show Certificate ID: Toggle to display the certificate ID.
- Show Subject: Toggle to display the subject of the certificate.
- Show Issuer: Toggle to display the issuer of the certificate.
- Show Valid From/To Dates: Toggle to display the validity period of the certificate.
- Show Fingerprint: Toggle to display the fingerprint of the certificate.
- Highlighting Options: Enable or disable highlighting of detected certificates and adjust the opacity.

<strong>Usage</strong>
- The popup will display any detected certificates on the current page.
- You can configure the settings by going to the extension options.

<strong>Contributing</strong>
Contributions are welcome! If you would like to contribute to the project, please fork the repository and submit a pull request. You can also report issues or suggest features.

<strong>License</strong>
This project is licensed under the Mozilla Public License Version 2.0. See the LICENSE file for details.

## Rankings

- #25,127 — Overall
- #61 — detect

## Permissions and access

### Permissions

- `activeTab`
- `storage`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** Moderate 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).

## Similar extensions and apps

- [Certificate Viewer for Humans](https://chrome-stats.com/d/certificate-viewer-for-humans) — 78 users, 4.50 / 5
- [Cert Validity Monitor](https://chrome-stats.com/d/cert-validity-monitor) — 1 users
- [Corporate certificate detector](https://chrome-stats.com/d/corporate-certificate-detector) — 9 users, 5.00 / 5
- [cerdicator](https://chrome-stats.com/d/cerdicator) — 1 users
- [Anti Certificate Spoofing](https://chrome-stats.com/d/anti-certificate-spoofing) — 4 users, 4.67 / 5
- [Secure CertiMate](https://chrome-stats.com/d/secure-certimate)
- [Certificate Revocation Checker](https://chrome-stats.com/d/certificate-revocation-checker)
- [CertMonitor](https://chrome-stats.com/d/certmonitor) — 1 users
- [Certage](https://chrome-stats.com/d/certage) — 24 users
- [Cert Monitor](https://chrome-stats.com/d/cert-monitor)
- [Cert Info Plus](https://chrome-stats.com/d/cert-info-plus) — 6 users
- [Secure CertiTracker](https://chrome-stats.com/d/secure-certitracker)

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