# Content Safety Lock

> Web content blocker to detect sites that have voluntarily self-labeled as containing sensitive content.

Canonical page: [https://chrome-stats.com/d/content-safety-lock](https://chrome-stats.com/d/content-safety-lock)

## Overview

- **ID:** `content-safety-lock`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Dan Wright
- **Category:** privacy-security,search-tools,social-communication
- **Daily users:** 3
- **Weekly downloads:** 1
- **Version:** 1.4.3
- **Last updated:** 2026-06-01
- **First published:** 2025-10-26
- **Size:** 150 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/content-safety-lock/)
- **Website:** [https://github.com/dwright/content-safety-lock/issues](https://github.com/dwright/content-safety-lock/issues)

## Description

Monitors sites where publishers have voluntarily self-labeled their content as unsafe and blocks those pages.  Works for the following sites:
<ul><li>Any site that has included certain standard headers in their HTML</li><li>Age verification sites / Age verification popups or redirects.</li><li>Any sites that honor "Prefer: safe" http request headers.</li><li>Google (force safe search)</li><li>Bing (strict mode)</li><li>Yahoo (strict mode)</li><li>YouTube (strict or moderate mode)</li><li>Tumblr (Block "mature" posts)</li><li>Reddit (filter out "NSFW" content)</li><li>Etsy (block "mature" tagged products)</li><li>Redbubble (mature content)</li><li>TeePublic (explicit content)</li><li>Zazzle (R-rated products)</li><li><a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/494e9a0368c24e920d59d83af654fbebd8602c0394b716bbd4d2c5ada187ff81/http%3A//itch.io" rel="nofollow">itch.io</a> (adult content)</li><li>eBay (Sexual Wellness category)</li><li>Amazon (Sexual Wellness category)</li><li>Patreon (18+ creators)</li><li>Shopify stores (age-gated content)</li></ul>

## Rankings

- #57,430 — Overall
- #103 — shopify

## Permissions and access

### Permissions

- `storage`
- `tabs`
- `alarms`
- `webRequest`
- `webRequestBlocking`
- `scripting`
- `<all_urls>`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Moderate 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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Source: [Chrome-Stats](https://chrome-stats.com/d/content-safety-lock)