Examine source code of (WebUSB + WebHID)

{
  "manifest_version": 2,
  "name": "awawausb (WebUSB + WebHID)",
  "version": "0.10",
  "default_locale": "en",
  "description": "__MSG_manifest_descr__",
  "browser_specific_settings": {
    "gecko": {
      "id": "webusb-hid-merged@sulee.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "browser_action": {
    "default_icon": "icons/browser-action.png",
    "default_title": "__MSG_button_open_debug__"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "run_at": "document_start",
      "world": "ISOLATED",
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    },
    {
      "all_frames": true,
      "run_at": "document_start",
      "world": "MAIN",
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "streams-compat.js",
        "page.js",
        "hid_page.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "hid-parser.js",
      "awawausb.js"
    ],
    "persistent": true
  },
  "permissions": [
    "nativeMessaging",
    "notifications",
    "storage"
  ]
}