Blackout: Browser Privacy Screen от Blue Speck

Blackout privacy screen creates a protective overlay to conceal your screen’s content, revealing only what's under your cursor. It is designed to protect your screen's visibility wherever you are.

Ideal for professionals and privacy-conscious users, this extension offers a unique way to keep your on-screen data private, even in public spaces.

For even more control and the ability to use Blackout across all your apps, look out for Blackout Desktop on Mac and Windows (coming soon).