Google Mail Notification Sound

An improvement upon the Google Mail Checker extension: plays a notification sound when new, unread e-mails are fetched.

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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "background": {
    "persistent": false,
    "page": "background.html"
  },
  "browser_action": {
    "default_icon": "gmail_not_logged_in.png"
  },
  "default_locale": "en",
  "description": "__MSG_gmailcheck_description__",
  "icons": {
    "128": "icon_128.png"
  },
  "name": "__MSG_gmailcheck_name__",
  "permissions": [
    "alarms",
    "tabs",
    "webNavigation",
    "*://*.google.com/"
  ],
  "version": "4.4.0",
  "manifest_version": 2
}