Examine source code of Idle Media Timeout

{
  "description": "Reloads or unloads pages still playing media after a configurable period without user activity. Especially useful for pausing streaming content that you might otherwise sleep through!",
  "manifest_version": 2,
  "name": "Idle Media Timeout",
  "version": "0.0.1",
  "icons": {
    "16": "icons/294398_monitor_business_work_fast_late_icon.svg",
    "32": "icons/294398_monitor_business_work_fast_late_icon.svg",
    "48": "icons/294398_monitor_business_work_fast_late_icon.svg",
    "64": "icons/294398_monitor_business_work_fast_late_icon.svg",
    "128": "icons/294398_monitor_business_work_fast_late_icon.svg"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "idle",
    "alarms",
    "notifications",
    "storage"
  ],
  "browser_action": {
    "default_title": "Idle Media Timeout",
    "default_popup": "popup/index.html",
    "default_icon": "icons/294398_monitor_business_work_fast_late_icon.svg"
  },
  "options_ui": {
    "page": "popup/index.html"
  },
  "web_accessible_resources": [],
  "background": {
    "page": "background.html"
  }
}