# Certificate Pinner

> Pins TLS certificates of configured web pages and interrupts/alerts when a new certificate is presented. Adds a button to the browser's toolbar for pinning and unpinning.

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

## Overview

- **ID:** `certificate-pinner`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Heurekus
- **Category:** privacy-security
- **Daily users:** 60
- **Weekly downloads:** 5
- **Rating:** 4.40 / 5 (10 ratings)
- **Version:** 0.17.10
- **Last updated:** 2020-07-10
- **First published:** 2019-06-18
- **Size:** 32 KB
- **Data as of:** 2026-09-09
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/certificate-pinner/)
- **Website:** [https://codeberg.org/heurekus/certificate-pinner-for-firefox](https://codeberg.org/heurekus/certificate-pinner-for-firefox)

## Description

Certificate Pinner is a Chrome extension that enhances your browser's security by allowing you to pin TLS certificates for specific web pages. It monitors the TLS certificates presented when you visit configured sites and interrupts the connection if a new certificate is detected that doesn’t match the stored fingerprint. This proactive approach prevents session hijacking and protects your local secrets like cookies and passwords from being sent to potentially malicious servers.

With an easy-to-use toolbar button, you can quickly pin or unpin certificates and view all your pinned certificates at a glance. When a mismatched certificate is detected, the extension opens a warning tab providing details about the new certificate, enabling you to verify its authenticity before proceeding. Certificate Pinner is a crucial tool for users keen on maintaining high standards of online security and trust when browsing.

## Rankings

- #14,704 — Overall
- #13 — winner
- #90 — present
- #144 — education
- #168 — catalog
- #172 — education

## Permissions and access

### Permissions

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

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** 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 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).

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- [PinPatrol](https://chrome-stats.com/d/pinpatrol) — 42 users, 3.50 / 5
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Source: [Chrome-Stats](https://chrome-stats.com/d/certificate-pinner)