Examine source code of WebHID

{
  "manifest_version": 3,
  "name": "WebHID",
  "version": "2.2.0",
  "description": "WebHID API implementation for Firefox",
  "icons": {
    "48": "icons/icon.svg"
  },
  "permissions": [
    "nativeMessaging",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "webRequestFilterResponse",
    "notifications"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "js/utils/bootstrap.js",
      "js/utils/resource.js",
      "js/utils/http.js",
      "js/utils/logger.js",
      "js/utils/settings.js",
      "js/utils/base64.js",
      "js/background.js"
    ]
  },
  "page_action": {
    "default_popup": "html/popup.html",
    "default_icon": "icons/gamepad.svg",
    "show_matches": [
      "http://*/*",
      "https://*/*"
    ]
  },
  "action": {
    "default_icon": "icons/icon.svg",
    "default_title": "WebHID"
  },
  "options_ui": {
    "page": "html/settings.html",
    "browser_style": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/utils/bootstrap.js",
        "js/utils/resource.js",
        "js/utils/http.js",
        "js/utils/logger.js",
        "js/utils/device.js",
        "js/utils/settings.js",
        "js/polyfill.js"
      ],
      "world": "MAIN",
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/utils/bootstrap.js",
        "js/utils/resource.js",
        "js/utils/http.js",
        "js/utils/logger.js",
        "js/utils/device.js",
        "js/utils/settings.js",
        "js/picker.js",
        "js/bridge.js"
      ],
      "world": "ISOLATED",
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "webhid@k4zoku.dev",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ],
        "optional": []
      }
    }
  }
}