Background Pages and Apps
Chrome uses an advanced program engine which works like a lightweight operating system — Google offers a more developed full-scale Chrome OS for low-powered computer systems. Web apps and pages are allowed to run in the background without being visible on screen; like background processes in Windows, this activity is allowed to improve system security, optimize loading times for extensions and apps, and add extra functionality to Chrome.
Disabling Background Activity
If Chrome is closed but there are background pages or apps still running on your PC, this is indicated with a Chrome icon in the notification area of the Windows Taskbar. To stop all Chrome activity, right-click this icon and quit the program. To prevent background pages and apps from running in the first place open up the advanced section of the Chrome Settings page and uncheck the box with the “Continue running background apps when Google Chrome is closed” label. This prevents all extensions and apps from operating whenever Chrome itself isn’t running on the system.