ScreenLab | Multi-Screen Preview

Name: ScreenLab | Multi-Screen Preview
Author: Lucas

By: Lucas

Multiple screen preview for responsive web development - view pages at different device sizes, all synchronized

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Install

Features & Capabilities

Stop wondering if your site looks right. Know it does.

Stop resizing your browser window over and over. ScreenLab lets you view any webpage across multiple device sizes simultaneously — no more guesswork, no more missed breakpoints.

🎯 One Click. Every Screen. Toggle ScreenLab and instantly see your site rendered across phones, tablets, and desktops side by side. Test responsive layouts in real-time without leaving your browser.

📱 Pixel-Perfect Device Presets iPhone, iPad, Android, MacBook, 4K monitors — all the devices your users actually use. Pre-configured viewport sizes so you can test what matters.

✨ Custom Viewports Need a specific screen size? Create unlimited custom viewports. Save them for quick access across all your projects.

🔒 Lock Height Mode Keep all screens contained within your viewport, or unlock to see full-page scrolling behavior. You control the view.

🔄 Synchronized Scrolling Scroll once, scroll everywhere. All viewports stay perfectly in sync so you can compare sections across every breakpoint instantly.

📸 One-Click Screenshot Export Capture all viewports at once and download as a ZIP. Perfect for design reviews, client presentations, or QA documentation.

🌙 Dark Mode Built In Easy on the eyes during late-night debugging sessions. Toggle between light and dark themes instantly.

⚡ Works Everywhere Chrome, Firefox — ScreenLab runs on all major browsers. Test any website, any URL, any time.

💎 Free plan with everything you need Test up to 3 screens at the same time for free. Upgrade to our really cheap subscription-less "Plus" plan for unlimited viewports, custom presets, and screenshot exports.

User Growth & Download Statistics

Add-on

By:

Lucas

Daily users:

6 1

Version:

1.0.0 Last updated: 2026-03-14

Version code:

6178463

Creation date:

2026-03-11

Risk:

Permissions:

Host permissions:

<all_urls>

Content scripts matches:

<all_urls>

Size:

154.21KB

Email:

co*****@bitter.works

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-12

Compare stats and ranking:

Ranking

# 40,342 ▲ 2,920

Other rankings

#79 in preview keyword 15 ▲ 9#193 in review keyword 18 ▲ 12#198 in screen keyword 90 ▲ 17#237 in screen time keyword 17 ▲ 10

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Lucas

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/screenlab/

Email:

co*****@bitter.works

Website:

https://bitter.works

Is ScreenLab | Multi-Screen Preview Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

ScreenLab | Multi-Screen Preview requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
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Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

ScreenLab | Multi-Screen Preview may not be trust-worthy. Avoid installing if possible unless you really trust this publisher.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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