No Focus Spying is a free Chrome add-on developed by FreedomApps. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This program aims to prevent websites from being able to determine whether the tab or window is currently visible or not.

With No Focus Spying, you can protect your privacy by preventing sites from using techniques like Canvas to detect if the tab or window has focus. This can be useful in scenarios where you don't want websites to track your activity or gather information about your browsing habits.

By blocking this kind of spying, No Focus Spying ensures that your online activities remain private and that you have more control over your browsing experience. This simple and straightforward Chrome add-on is a valuable tool for those who prioritize their privacy while using the internet.