This feature is not on a current W3C standards track, but it is supported on the Firefox OS platform. Although implementations may change in the future and it is not supported widely across browsers, it is suitable for use in code dedicated to Firefox OS apps.
uuids property provides the list of all Bluetooth services' UUIDs the device's adapter is able to provide. See the Bluetooth specification assigned numbers part for an exhaustive list of possible services' UUIDs.
var uuids = instanceOfBluetoothAdapter.uuids
Array of strings.
Not part of any specification yet. It should be discussed as part of the W3C's System Applications Working Group.