# Focus & Visibility Guard

> Prevents websites from detecting tab switching, window blur/focus, or visibility changes.

Canonical page: [https://chrome-stats.com/d/focus-visibility-guard](https://chrome-stats.com/d/focus-visibility-guard)

## Overview

- **ID:** `focus-visibility-guard`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** mwelford
- **Category:** privacy-security
- **Daily users:** 1
- **Weekly downloads:** 2
- **Version:** 1.2.0
- **Last updated:** 2026-08-09
- **First published:** 2026-08-06
- **Size:** 23 KB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/focus-visibility-guard/)
- **Website:** [https://github.com/mwelford2/focus-visibility-guard](https://github.com/mwelford2/focus-visibility-guard)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/focus-visibility-guard/privacy/](https://addons.mozilla.org/firefox/addon/focus-visibility-guard/privacy/)

## Description

Focus & Visibility Guard prevents websites from detecting when you switch tabs, minimize windows, or switch to other applications. It intercepts the Page Visibility API (document.visibilityState, document.hidden) and window focus/blur events, keeping your browser state private from website scripts.

Common use cases include online exams, timed assessments, or any situation where you want to prevent a site from reacting to tab switches. The extension works entirely in the browser — it collects no data, makes no network requests, and stores all settings locally using browser.storage.local.

Source code: <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/aa41858220ebe8acece14be50038aee6799863931f11024bda7bfbb14c10b6b2/https%3A//github.com/mwelford2/focus-visibility-guard" rel="nofollow">https://github.com/mwelford2/focus-visibility-guard</a>

## Rankings

- #109,440 — Overall
- #31 — visibility
- #246 — focus

## Permissions and access

### Permissions

- `<all_urls>`
- `storage`
- `activeTab`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** High 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 was recently updated in the past month. New updates 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/focus-visibility-guard)