Examine source code of Google Apps Launcher

{
  "manifest_version": 2,
  "name": "Google Apps Launcher",
  "version": "1.1",
  "description": "Google-style apps launcher for quick access to most popular Google services",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon.svg"
  },
  "icons": {
    "16": "icons/icon.svg",
    "32": "icons/icon.svg",
    "48": "icons/icon.svg",
    "128": "icons/icon.svg"
  },
  "applications": {
    "gecko": {
      "id": "google-apps-launcher@example.com",
      "strict_min_version": "58.0"
    }
  }
}