Examine source code of Roblox Player Notifier

{
  "manifest_version": 3,
  "name": "Roblox Player Notifier",
  "version": "2.3",
  "description": "Get notified when watched Roblox players come online, join a game, or go offline. Includes a 7-day activity log.",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "compat-shim.js",
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{284d4967-6ee2-4caf-899a-6d94713340d2}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "notifications",
    "alarms",
    "storage",
    "tabs",
    "cookies"
  ],
  "host_permissions": [
    "https://presence.roblox.com/*",
    "https://users.roblox.com/*",
    "https://thumbnails.roblox.com/*",
    "https://auth.roblox.com/*",
    "https://www.roblox.com/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png"
    }
  }
}