[lordvorp]

Summary

• Registers tab, window, alarm, and notification listeners when the service worker starts, so duplicate detection still runs after Chrome unloads the worker.
• Stores last-used times in chrome.storage.session and runs auto-close with chrome.alarms instead of an in-memory setInterval.
• Documents those choices in the README. The duplicate prompt is a notification with "Switch to existing" and "Keep both", because a service worker cannot call confirm().

Test plan

• Load the extension unpacked and confirm the toolbar badge shows the open-tab count.
• Open the popup and focus or close a tab.
• Enable duplicate detection, open the same URL twice, and confirm the notification offers both choices.
• Enable auto-close, restart Chrome, and confirm the tabJanitor alarm still exists in the extension service worker.
• node __tests__/manifest.test.js

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