Better Google Calendar Alert

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Better Google Calendar Alert",
  "short_name": "Better Alert",
  "description": "Replaces the Google Calendar popup with something less intrusive",
  "version": "1.0.1",
  "icons": {
    "16": "gcal-alert16.png",
    "32": "gcal-alert32.png",
    "48": "gcal-alert48.png",
    "64": "gcal-alert64.png",
    "128": "gcal-alert128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.google.com/calendar/*",
        "https://calendar.google.com/calendar/*"
      ],
      "css": [
        "gcal-alert.css"
      ],
      "js": [
        "gcal-alert.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "icon-bell.svg",
    "sound-notification.ogg",
    "favicon.ico"
  ],
  "permissions": [
    "activeTab"
  ]
}