
Screen Spoofer by Screen Spoofer
Simulate websites in custom screen sizes via a secure popup. Perfect for developers testing responsive design and layouts.
You'll need Firefox to use this extension
Extension Metadata
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.
🔹 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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Permissions and dataLearn more
Required permissions:
- Access browsing history
- Access browser tabs
- Access your data for all websites
More information
- Add-on Links
- Version
- 1.12
- Size
- 39.03 KB
- Last updated
- 16 hours ago (Jun 27, 2025)
- Related Categories
- License
- Mozilla Public License 2.0
- Privacy Policy
- Read the privacy policy for this add-on
- Version History
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Release notes for 1.12
Version 1.12 – 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.
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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