Examine source code of IO Tools - Developer Kit

{
  "manifest_version": 2,
  "name": "IO Tools - Developer Kit",
  "version": "2.0.0",
  "description": "50 tools that run in your side panel: encode, hash, convert, generate. Plus search across every tool on iotools.cloud.",
  "permissions": [
    "idle",
    "contextMenus",
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": {
      "16": "assets/images/icon16.png",
      "32": "assets/images/icon32.png",
      "48": "assets/images/icon48.png",
      "128": "assets/images/icon128.png"
    }
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+0",
        "mac": "Command+Shift+0"
      },
      "description": "Open the IO Tools panel"
    }
  },
  "background": {
    "scripts": [
      "assets/js/background.js"
    ]
  },
  "icons": {
    "16": "assets/images/icon16.png",
    "32": "assets/images/icon32.png",
    "48": "assets/images/icon48.png",
    "128": "assets/images/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5f44f3fc-071e-4393-87a1-56a8d98cb221}"
    }
  }
}