Examine source code of Saline Signals

{
  "manifest_version": 3,
  "name": "Saline Signals",
  "version": "1.0.0",
  "description": "Toolbar alerts when your Neopets guild has new messages.",
  "action": {
    "default_title": "Saline Signals",
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/48.png",
      "96": "icons/96.png"
    }
  },
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "permissions": [
    "storage",
    "alarms",
    "notifications",
    "tabs"
  ],
  "host_permissions": [
    "https://www.neopets.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.neopets.com/guilds/guild_board.phtml*"
      ],
      "js": [
        "content/emoji-toolbar.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "neopets-guild-notifier@example.com",
      "strict_min_version": "109.0"
    }
  }
}