Examine source code of Google Accounts Autopilot

{
  "name": "Google Accounts Autopilot",
  "version": "0.5",
  "description": "Set default accounts and schedules for your Google services. Automatically switch between accounts on Gmail, YouTube, and more.",
  "manifest_version": 3,
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/*",
        "*://*.gmail.com/*",
        "*://*.youtube.com/*"
      ],
      "run_at": "document_start",
      "js": [
        "content.js"
      ],
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "default-google-account@auduongtuan.github.com"
    }
  },
  "permissions": [
    "storage",
    "webNavigation"
  ],
  "host_permissions": [
    "*://*.google.com/*",
    "*://*.gmail.com/*",
    "*://*.youtube.com/*"
  ],
  "action": {
    "default_title": "Google Accounts Autopilot",
    "default_popup": "index.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}