Warn On Tab With Sound Closure

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Warn On Tab With Sound Closure",
  "short_name": "WarnOnTabWithSoundClosure",
  "description": "On attempt to close an audible tab, prompts the user for the confirmation.",
  "version": "1.2",
  "icons": {
    "16": "img/icon16.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "browser_action": {
    "default_popup": "html/popup.html",
    "default_title": "Warn On Tab With Sound Closure"
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "js": [
        "scripts/content.js"
      ]
    }
  ]
}