Screen Spoofer by Screen Spoofer

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

Available on Firefox for Android™

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You’ll need Firefox to use this extension

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About this extension

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.

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Release notes for 1.21

Version 1.21 – Stable Release
This update includes cleaner and more optimized code, resulting in improved performance and more precise logic execution. UI and interaction flows have been enhanced for a smoother user experience.

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