Examine source code of TurboNav - Tab Manager

{
  "manifest_version": 2,
  "name": "TurboNav - Tab Manager",
  "version": "0.8.4",
  "icons": {
    "16": "assets/icons/favicon-16.png",
    "32": "assets/icons/favicon-32.png",
    "48": "assets/icons/favicon-48.png",
    "128": "assets/icons/favicon-128.png"
  },
  "description": "Turbocharge your browser tab management experience",
  "homepage_url": "https://turbonav.com",
  "short_name": "TurboNav",
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "alarms",
    "notifications"
  ],
  "optional_permissions": [
    "downloads"
  ],
  "author": "TurboNav",
  "browser_specific_settings": {
    "gecko": {
      "id": "{C40AF183-5736-47BD-9F25-13E13C6C065B}"
    }
  },
  "background": {
    "scripts": [
      "background.bundle.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "assets/icons/favicon-16.png",
      "32": "assets/icons/favicon-32.png",
      "48": "assets/icons/favicon-48.png"
    },
    "default_title": "Open TurboNav"
  },
  "commands": {
    "toggle-turbonav": {
      "suggested_key": {
        "default": "Ctrl+Shift+Space",
        "mac": "Command+Shift+Space"
      },
      "description": "Toggle TurboNav"
    },
    "save-link": {
      "suggested_key": {
        "default": "Ctrl+Shift+S",
        "mac": "Command+Shift+S"
      },
      "description": "Save Link"
    },
    "schedule-tab": {
      "suggested_key": {
        "default": "Ctrl+Shift+C",
        "mac": "Command+Shift+C"
      },
      "description": "Schedule Tab"
    }
  },
  "web_accessible_resources": [
    "css/turboNavApp.css",
    "assets/icons/*.png",
    "turbonav.html"
  ]
}