Examine source code of Hack.Chat Notifications

{
  "manifest_version": 2,
  "name": "Hack.Chat Notifications",
  "version": "1.6resigned1",
  "applications": {
    "gecko": {
      "id": "pines@null.net"
    }
  },
  "description": "Adds desktop and sound notifications to hack.chat for mentions, whispers, and invites, and warnings. See messages directed at you more clearly.",
  "icons": {
    "16": "icons/favicon-16x16.png",
    "32": "icons/favicon-32x32.png",
    "48": "icons/favicon-48x48.png",
    "64": "icons/favicon-64x64.png",
    "96": "icons/favicon-96x96.png",
    "128": "icons/favicon-128x128.png",
    "192": "icons/favicon-192x192.png"
  },
  "permissions": [
    "notifications"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://hack.chat/*",
        "http://hack.chat/*"
      ],
      "js": [
        "content_scripts/injectNotifier.js"
      ]
    }
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icons/favicon-16x16.png",
      "32": "icons/favicon-32x32.png",
      "48": "icons/favicon-48x48.png",
      "64": "icons/favicon-64x64.png",
      "96": "icons/favicon-96x96.png",
      "128": "icons/favicon-128x128.png",
      "192": "icons/favicon-192x192.png"
    },
    "default_title": "Hack.Chat Notifications",
    "default_popup": "popup/settings.html"
  },
  "web_accessible_resources": [
    "content_scripts/injectNotifier.js",
    "content_scripts/notify.js",
    "assets/notify.ogg"
  ]
}