# Opener Detector

> Checks for window.opener vulnerabilities as you browse, and shows a report page whenever one is found. Can be configured to ignore individual pages or whole domains.

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

## Overview

- **ID:** `opener-detector`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Harry Cutts
- **Category:** web-development,privacy-security
- **Version:** 1.0.1resigned1
- **Last updated:** 2024-04-25
- **First published:** 2017-05-01
- **Size:** 36 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/opener-detector/)
- **Website:** [https://github.com/HarryCutts/opener-detector/issues?q=is%3Aopen%20sort%3Aupdated-desc%20](https://github.com/HarryCutts/opener-detector/issues?q=is%3Aopen%20sort%3Aupdated-desc%20)

## Description

Opener Detector is a browser extension that checks for window.opener vulnerabilities as you browse. It shows a report page whenever a vulnerability is found and can be configured to ignore individual pages or whole domains.

## Rankings

- #140,370 — Overall

## Permissions and access

### Permissions

- `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).

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