# Screen Spoofer

> Simulate websites in custom screen sizes via a secure popup. Perfect for developers testing responsive design and layouts.

Canonical page: [https://chrome-stats.com/d/screen-spoofer](https://chrome-stats.com/d/screen-spoofer)

## Overview

- **ID:** `screen-spoofer`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Screen Spoofer
- **Category:** web-development,privacy-security,tabs
- **Daily users:** 10
- **Rating:** 1.00 / 5 (1 ratings)
- **Version:** 1.21
- **Last updated:** 2025-07-03
- **First published:** 2025-06-18
- **Size:** 42 KB
- **Data as of:** 2026-09-09
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/screen-spoofer/)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/screen-spoofer/privacy/](https://addons.mozilla.org/firefox/addon/screen-spoofer/privacy/)

## Description

Screen Spoofer is a powerful screen simulation utility designed for developers who need to test websites in different screen resolutions. Whether you're working on a responsive layout, testing device-specific behavior, or previewing UI changes, this extension lets you simulate screens quickly and securely.

🔹 Features:
- Simulate custom or predefined screen resolutions
- Choose from popular devices like iPhone, Android, tablets, etc.
- Opens a popup window with exact dimensions
- Clean and easy-to-use popup interface
- Secure access only for authorized users

Ideal for:
- Frontend developers
- UI/UX designers
- QA engineers

No third-party frameworks or build tools used. This extension is built entirely using HTML, CSS, and vanilla JavaScript for performance and simplicity.

Note: This extension is intended for internal development use only.

## Rankings

- #33,277 — Overall
- #22 — spoon
- #108 — ux
- #148 — screen
- #206 — response
- #212 — screen time

## Permissions and access

### Permissions

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

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** Very 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/screen-spoofer)