I don't know why, but the web serial api is disabled in FreeBSD chromium builds. This means I can't manage serial devices via my web browser (a common thing these days). eg: I have multi programable keyboards, and they use a website and serial communications to maintain the device. This was raised in the FreeBSD Forum, where I discovered that it wasn't user permission issues, but rather that chromium is not built with Serial API enabled. https://forums.FreeBSD.org/threads/manage-usb-devices-via-chromium-serial-api.92255/post-652150 Examples of website with serial web api functionality 1. https://manager.charachorder.com/config/layout/ 2. https://www.serialterminal.com