# Screen Sizer

> Resize your browser window to mimic different screen sizes. Save, manage and share presets with your team.

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

## Overview

- **ID:** `screen-sizer-tool`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Connor Nee
- **Category:** web-development
- **Daily users:** 46
- **Weekly downloads:** 4
- **Version:** 1.0.0
- **Last updated:** 2026-02-23
- **First published:** 2026-02-20
- **Size:** 403 KB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/screen-sizer-tool/)

## Description

Screen Sizer helps developers and QA engineers resize the browser window to mimic real device sizes and CSS breakpoints—no dev tools required.

• Built-in presets — iPhones, iPads, Pixels, Galaxy devices, laptops, desktops, and standard breakpoints
• Custom presets — save your own widths and heights with a name
• Favorites — star presets for one-click access
• Quick resize — type any width × height and apply instantly
• Import/Export — share preset JSON files with your team so everyone tests the same sizes
• Current size — see the window dimensions at a glance
• Dark/Light theme — follows your system or choose manually

Works in Chrome, Edge, and Firefox. All data stays in your browser; nothing is sent to any server.

## Rankings

- #16,881 — Overall
- #46 — size
- #69 — screen
- #92 — screen time
- #96 — laptop
- #96 — resize

## Permissions and access

### Permissions

- `storage`
- `activeTab`
- `tabs`

## Safety

- **Risk impact:** Moderate 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).

## Similar extensions and apps

- [Screen Sizer](https://chrome-stats.com/d/screen-sizer) — 19 users
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- [ScreenLab | Multi-Screen Preview](https://chrome-stats.com/d/screenlab) — 11 users
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- [Responsive Design Tester Pro](https://chrome-stats.com/d/responsive-design-tester-pro) — 14 users, 1.00 / 5
- [Custom Window Resizer](https://chrome-stats.com/d/custom-window-resizer) — 37 users
- [Screen Spoofer](https://chrome-stats.com/d/screen-spoofer) — 11 users, 1.00 / 5
- [Quick Window Resizer](https://chrome-stats.com/d/quick-window-resizer) — 1 users
- [Viewport Resizer Plus](https://chrome-stats.com/d/viewport-resizer-plus) — 34 users
- [Window Resizer HM](https://chrome-stats.com/d/window-resizer-hm)

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Source: [Chrome-Stats](https://chrome-stats.com/d/screen-sizer-tool)