pxt-calliope/clients/chrome/manifest.json

{
  "app": {
    "background": {
      "scripts": [ "background.js" ]
    }
  },

  "manifest_version": 2,
  "name": "pxt.microbit.org",
  "version": "0.7.0",
  "author": "Microsoft Corporation",
  "short_name": "pxt.microbit.org",

  "description": "Extension for https://pxt.microbit.org.",
  "homepage_url": "https://pxt.microbit.org",
  "offline_enabled": "true",
  "icons": {
    "48": "logo48.png",
    "128": "logo128.png"
  },

  "permissions": [
    "serial",
    "usb"
  ],

  "externally_connectable": {
    "matches": [ "*://localhost/*", "https://pxt.microbit.org/*", "https://*.microbit.org/*" ]
  }
}