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diff --git a/dom/webidl/U2F.webidl b/dom/webidl/U2F.webidl
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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is a combination of the FIDO U2F Raw Message Formats:
+ * https://fidoalliance.org/specs/fido-u2f-v1.0-nfc-bt-amendment-20150514/fido-u2f-raw-message-formats.html
+ * and the U2F JavaScript API v1.1, not yet published. While v1.1 is not published,
+ * v1.0, is located here:
+ * https://fidoalliance.org/specs/fido-u2f-v1.0-nfc-bt-amendment-20150514/fido-u2f-javascript-api.html
+ */
+
+[NoInterfaceObject]
+interface GlobalU2F {
+  [Throws, Pref="security.webauth.u2f"]
+  readonly attribute U2F u2f;
+};
+
+typedef unsigned short ErrorCode;
+typedef sequence<Transport> Transports;
+
+enum Transport {
+    "bt",
+    "ble",
+    "nfc",
+    "usb"
+};
+
+dictionary ClientData {
+    DOMString             typ; // Spelling is from the specification
+    DOMString             challenge;
+    DOMString             origin;
+    // cid_pubkey for Token Binding is not implemented
+};
+
+dictionary RegisterRequest {
+    DOMString version;
+    DOMString challenge;
+};
+
+dictionary RegisterResponse {
+    DOMString version;
+    DOMString registrationData;
+    DOMString clientData;
+
+    // From Error
+    ErrorCode? errorCode;
+    DOMString? errorMessage;
+};
+
+dictionary RegisteredKey {
+    DOMString   version;
+    DOMString   keyHandle;
+    Transports? transports;
+    DOMString?  appId;
+};
+
+dictionary SignResponse {
+    DOMString keyHandle;
+    DOMString signatureData;
+    DOMString clientData;
+
+    // From Error
+    ErrorCode? errorCode;
+    DOMString? errorMessage;
+};
+
+callback U2FRegisterCallback = void(RegisterResponse response);
+callback U2FSignCallback = void(SignResponse response);
+
+[Pref="security.webauth.u2f"]
+interface U2F {
+  // These enumerations are defined in the FIDO U2F Javascript API under the
+  // interface "ErrorCode" as constant integers, and also in the U2F.cpp file.
+  // Any changes to these must occur in both locations.
+  const unsigned short OK = 0;
+  const unsigned short OTHER_ERROR = 1;
+  const unsigned short BAD_REQUEST = 2;
+  const unsigned short CONFIGURATION_UNSUPPORTED = 3;
+  const unsigned short DEVICE_INELIGIBLE = 4;
+  const unsigned short TIMEOUT = 5;
+
+  [Throws]
+  void register (DOMString appId,
+                 sequence<RegisterRequest> registerRequests,
+                 sequence<RegisteredKey> registeredKeys,
+                 U2FRegisterCallback callback,
+                 optional long? opt_timeoutSeconds);
+
+  [Throws]
+  void sign (DOMString appId,
+             DOMString challenge,
+             sequence<RegisteredKey> registeredKeys,
+             U2FSignCallback callback,
+             optional long? opt_timeoutSeconds);
+};