Mobile Simulator Extension MSIM: Responsive Viewer by Mobile Simulator (MSIM)

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:

1) 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.
2) Android Suite: Samsung Galaxy S25, S24 Ultra, S23/S22, Google Pixel 9 / 9 Pro, Pixel 8 / 7, OnePlus 9, and Xiaomi Mi 11.
3) Tablets: iPad Pro 11 & 13 (incl. M4), iPad Air 13, Galaxy Tab S10, S9, and S8.
4) 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.