# Certificate expiration

> Shows how many days the website certificate has left until is expires.

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

## Overview

- **ID:** `certificate-expiration`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Johan
- **Category:** privacy-security
- **Daily users:** 163
- **Rating:** 4.67 / 5 (6 ratings)
- **Version:** 3.0
- **Last updated:** 2023-07-21
- **First published:** 2020-03-01
- **Size:** 52 KB
- **Data as of:** 2026-09-10
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/certificate-expiration/)
- **Website:** [https://github.com/johansigfrids/expirator](https://github.com/johansigfrids/expirator)

## Description

## Certificate Expiration Extension

Keep track of website SSL certificate expiration dates effortlessly with the Certificate Expiration Firefox extension. This simple tool displays the number of days left before the current website's SSL certificate expires directly in your browser toolbar. 

The extension adds a padlock icon indicating certificate status—showing days remaining as a numeric overlay. If the certificate is nearing expiration (less than 29 days remaining), the icon turns red to alert you. For sites without encrypted connections, an unlocked red padlock icon is displayed, enhancing your awareness of security risks. Stay informed and browse safely with this lightweight and user-friendly extension.

## Rankings

- #9,087 — Overall
- #30 — notification
- #75 — location
- #83 — education
- #105 — education
- #108 — catalog

## Permissions and access

### Permissions

- `webRequest`
- `webRequestBlocking`
- `<all_urls>`
- `tabs`

## Safety

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

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- [SSL Expiry Alert](https://chrome-stats.com/d/ssl-expiry-alert) — 6 users

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