Examine source code of Codebird.app

{
  "manifest_version": 2,
  "name": "Codebird",
  "version": "0.2.1",
  "icons": {
    "16": "assets/icons/16w.png",
    "32": "assets/icons/32w.png",
    "48": "assets/icons/48w.png",
    "128": "assets/icons/128w.png"
  },
  "description": "The codebird companion extension. Press the icon on a setup domain to activate",
  "homepage_url": "https://codebird.app",
  "short_name": "Codebird",
  "permissions": [
    "activeTab",
    "identity",
    "storage",
    "https://codebird.app/*"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "author": "davidfurlong",
  "applications": {},
  "browser_action": {
    "default_icon": "assets/icons/48w.png",
    "default_title": "ON"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "js/background.bundle.js"
    ],
    "persistent": false
  },
  "web_accessible_resources": [
    "js/*",
    "*.html"
  ]
}