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When any installed hosted app, packaged app, or extension has «background» permission, Chrome runs (invisibly) as soon as the user logs into their computer—before the user launches Chrome. The «background» permission also makes Chrome continue running (even after its last window is closed) until the user explicitly quits Chrome.
You typically use the «background» permission with a background page or (for hosted apps) a background window.
"permissions": [ "contextMenus", "tabs", "http://*/*", "https://*/*" ],
Фоновый режим в Google Chrome