The Multi-Monitor Surveillance
Google Chrome features a specialized API known as “Window Placement.” This API is designed for highly complex web applications, such as professional presentation software or financial trading dashboards. It allows the website to actively scan your physical hardware setup to determine exactly how many monitors you have connected, what their resolutions are, and where they are physically positioned on your desk, enabling the site to automatically throw pop-up windows onto your second or third screen. If you refuse to allow an advertising network or a web script to map out your physical office hardware configuration, you must completely block this API.
How to Block Window Placement Access Globally
You can permanently blind the browser to your multi-monitor setup via the Site Settings.
- Open the Google Chrome desktop browser.
- Click the three vertical dots (⋮) in the top right corner and select Settings.
- In the left-hand sidebar, click on Privacy and security.
- In the main window, click on Site settings.
- Scroll down to the bottom and click to expand Additional permissions.
- Click on Window placement.
- Under the “Default behavior” heading, select the radio button for “Don’t allow sites to see information about your screens.”
A Single Screen Illusion
The change takes effect instantly. Google Chrome will completely sever its internal connection to the Windows or macOS display driver registry. The browser will instantly auto-reject every single background request from any website attempting to inventory your monitors. From the perspective of every website on the internet, you are now operating a single, generic monitor, completely neutralizing their ability to weaponize pop-ups or fingerprint your specific hardware configuration.