Mobile Simulator Extension MSIM: Responsive Viewer

Name: Mobile Simulator Extension MSIM: Responsive Viewer
Rating: 5 (1 reviews)
Author: Mobile Simulator (MSIM)

By: Mobile Simulator (MSIM) Add-on

Professional mobile device simulator with multiple views, extensive device library, and sync scrolling

Overview

Firefox Add-ons Store

Daily users

Data as of 2026-07-26

Rating:

5.00

(1)

Version:

2.1.13

Last updated: 2026-07-21

Features & Capabilities

Mobile Simulator Extension: Responsive Viewer Test, preview, and debug responsive designs across a massive library of mobile devices and tablets with the most powerful Mobile Simulator Extension on the Firefox Web Store.

🚀 Why Choose Mobile Simulator Pro? Designing for the modern web requires testing across dozens of screen sizes. Mobile Simulator Extension: Responsive Viewer transforms your browser into a professional testing suite, allowing you to simulate any smartphone or tablet directly on your desktop.

📱 Extensive Device Library Stop guessing how your site looks. Our Mobile Simulator provides high-fidelity frames for:

Apple iOS: iPhone 17 Pro / Pro Max, iPhone Air, iPhone 16 / 16 Pro, iPhone 15 series, classic models like iPhone SE, plus iPad Pro, iPad Air, and iPad Mini.
Android Suite: Samsung Galaxy S25, S24 Ultra, S23/S22, Google Pixel 9 / 9 Pro, Pixel 8 / 7, OnePlus 9, and Xiaomi Mi 11.
Tablets: iPad Pro 11 & 13 (incl. M4), iPad Air 13, Galaxy Tab S10, S9, and S8.
Custom Devices: Need a specific breakpoint? Use our Custom Device tool to enter any width and height.

🔥 Top Professional Features

Sync Scroll (Synchronized Scrolling): Scroll on one device and watch all other simulated screens follow in real-time. Perfect for side-by-side comparison testing.

Multi-View Mode: Open 2, 3, or 4 devices simultaneously to view your entire responsive grid at once.

Device Frames & Notches: See your website exactly as your users do, including hardware frames and screen notches for a realistic Mobile View.

One-Click Rotation: Instantly toggle between Portrait and Landscape modes to test orientation changes.

Quick Action Sets: Use pre-configured bundles like the "Popular 3-Pack" or "iOS Set" to speed up your workflow.

🛠 Built for Developers & Designers Whether you are a web developer debugging a CSS issue or a designer performing a UX audit, this Responsive Viewer provides a seamless environment to ensure your site is mobile-friendly. It is the ultimate alternative to the native Firefox Developer Tools, offering a more visual and intuitive Mobile Simulator experience.

✅ Key Keywords Covered:

Mobile Simulator Extension
Responsive Viewer Firefox Extension
Mobile View Extension
Smartphone Simulator
Device Simulator for Firefox

Transform your workflow today. Install the Mobile Simulator Extension: Responsive Viewer and build a better mobile web.

User Growth & Download Statistics

Add-on

By:

Mobile Simulator (MSIM)

Daily users:

Rating:

5.00

(1)

Version:

2.1.13 Last updated: 2026-07-21

Version code:

6362694

Creation date:

2026-07-18

Risk:

Permissions:

Host permissions:

http://*/*
https://*/*

Size:

37.43KB

Email:

su*****@msim.app

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-07-26

Compare stats and ranking:

Ranking

# 80,827 ▲

Other rankings

#94 in response keyword 10 ▲ #138 in mobile view keyword 28 ▲ #147 in mobile keyword 49 ▲ #236 in ux keyword 14 ▲

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:

Mobile Simulator (MSIM)

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/mobile-simulator-msim/

Email:

su*****@msim.app

Website:

https://msim.app

User Reviews

As a professional designer, this add-on is fantastic. It lets me preview websites on multiple devices at once: iPhone, tablet, and Android. This makes my responsive design work much faster and easier. Highly recommended!

by Sp*****, 2026-07-22

View all user reviews ›

Is Mobile Simulator Extension MSIM: Responsive Viewer 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.

Mobile Simulator Extension MSIM: Responsive Viewer 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.

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.

Mobile Simulator Extension MSIM: Responsive Viewer is recently added, and hasn't been around long enough for us to gather enough data to accurately assess its risk level.

Risk likelihood analysis details

High This extension was recently updated in the past month. New updates may not be stable or safe.
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