Content of the material
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The Small Print
Only apps and extensions that you've explicitly installed are allowed to run in the background — a standard Web page cannot continue running after you've closed down the relevant browser tab. In addition, the app or extension's background capabilities must be declared by the developer during the installation process. Check the description of the apps and extensions you install in Chrome to see whether they request permission to continue running even if there are no browser windows open.
Changing Background App Settings
Open up the Task Manager from the Chrome menu, and the apps and extensions that have background permissions are labeled with "Background Page." Select any item and choose "End Process" to stop it temporarily. It will restart the next time you start up Chrome. Extensions can be permanently disabled from the Extensions page on the Tools menu, while apps can be uninstalled from the New Tab page — click on the cross by an app icon to remove it from Chrome.