Examine source code of Native Touchbar

{
  "name": "Touchbar",
  "manifest_version": 2,
  "version": "0.1.0",
  "description": "Native macOS touchbar controls",
  "icons": {
    "48": "icons/touchbar-icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "native_touchbar@viktorstrate.github.com",
      "strict_min_version": "68.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "icons/touchbar-icon.svg",
    "default_title": "Touchbar",
    "default_popup": "popup.html"
  },
  "user_scripts": {
    "api_script": "touchbarScriptAPI.js"
  },
  "permissions": [
    "https://*/*",
    "http://*/*",
    "nativeMessaging",
    "storage",
    "tabs",
    "sessions"
  ]
}