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diff --git a/dom/webidl/NativeOSFileInternals.webidl b/dom/webidl/NativeOSFileInternals.webidl
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index 0000000000..27522a366c
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+++ b/dom/webidl/NativeOSFileInternals.webidl
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+/* 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 obtaone at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Options for nsINativeOSFileInternals::Read
+ */
+[GenerateInit]
+dictionary NativeOSFileReadOptions
+{
+  /**
+   * If specified, convert the raw bytes to a String
+   * with the specified encoding. Otherwise, return
+   * the raw bytes as a TypedArray.
+   */
+  DOMString? encoding;
+
+  /**
+   * If specified, limit the number of bytes to read.
+   */
+  unsigned long long? bytes;
+};
+
+/**
+ * Options for nsINativeOSFileInternals::WriteAtomic
+ */
+[GenerateInit]
+dictionary NativeOSFileWriteAtomicOptions
+{
+  /**
+   * If specified, specify the number of bytes to write.
+   * NOTE: This takes (and should take) a uint64 here but the actual
+   * value is limited to int32. This needs to be fixed, see Bug 1063635.
+   */
+  unsigned long long? bytes;
+
+  /**
+   * If specified, write all data to a temporary file in the
+   * |tmpPath|. Else, write to the given path directly.
+   */
+  DOMString? tmpPath = null;
+
+  /**
+   * If specified and true, a failure will occur if the file
+   * already exists in the given path.
+   */
+  boolean noOverwrite = false;
+
+  /**
+   * If specified and true, this will sync any buffered data
+   * for the file to disk. This might be slower, but safer.
+   */
+  boolean flush = false;
+
+  /**
+   * If specified, this will backup the destination file as
+   * specified.
+   */
+  DOMString? backupTo = null;
+};