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diff --git a/dom/chrome-webidl/PathUtils.webidl b/dom/chrome-webidl/PathUtils.webidl
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+++ b/dom/chrome-webidl/PathUtils.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/.
+ */
+
+/**
+ * PathUtils is a set of utilities for operating on absolute paths.
+ */
+[ChromeOnly, Exposed=(Window, Worker)]
+namespace PathUtils {
+  /**
+   * Return the last path component.
+   *
+   * @param path An absolute path.
+   *
+   * @returns The last path component.
+   */
+  [Throws]
+  DOMString filename(DOMString path);
+
+  /**
+   * Return an ancestor directory of the given path.
+   *
+   * @param path An absolute path.
+   * @param depth The number of ancestors to remove, defaulting to 1 (i.e., the
+   *              parent).
+   *
+   * @return The ancestor directory.
+   *
+   *         If the path provided is a root path (e.g., `C:` on Windows or `/`
+   *         on *NIX), then null is returned.
+   */
+  [Throws]
+  DOMString? parent(DOMString path, optional long depth = 1);
+
+  /**
+   * Join the given components into a full path.
+   *
+   * @param components The path components. The first component must be an
+   *                   absolute path. There must be at least one component.
+   */
+  [Throws]
+  DOMString join(DOMString... components);
+
+  /**
+   * Join the given relative path to the base path.
+   *
+   * @param base The base path. This must be an absolute path.
+   * @param relativePath A relative path to join to the base path.
+   */
+  [Throws]
+  DOMString joinRelative(DOMString base, DOMString relativePath);
+
+  /**
+   * Creates an adjusted path using a path whose length is already close
+   * to MAX_PATH. For windows only.
+   *
+   * @param path An absolute path.
+   */
+  [Throws]
+  DOMString toExtendedWindowsPath(DOMString path);
+
+  /**
+   * Normalize a path by removing multiple separators and `..` and `.`
+   * directories.
+   *
+   * On UNIX platforms, the path must exist as symbolic links will be resolved.
+   *
+   * @param path The absolute path to normalize.
+   *
+   */
+  [Throws]
+  DOMString normalize(DOMString path);
+
+  /**
+   * Split a path into its components.
+   *
+   * @param path An absolute path.
+   */
+  [Throws]
+  sequence<DOMString> split(DOMString path);
+
+  /**
+   * Split a relative path into its components.
+   *
+   * @param path A relative path.
+   */
+  [Throws]
+  sequence<DOMString> splitRelative(DOMString path, optional SplitRelativeOptions options = {});
+
+  /**
+   * Transform a file path into a file: URI
+   *
+   * @param path An absolute path.
+   *
+   * @return The file: URI as a string.
+   */
+  [Throws]
+  UTF8String toFileURI(DOMString path);
+
+  /**
+   * Determine if the given path is an absolute or relative path.
+   *
+   * @param path A file path that is either relative or absolute.
+   *
+   * @return Whether or not the path is absolute.
+   */
+  boolean isAbsolute(DOMString path);
+};
+
+[Exposed=Window]
+partial namespace PathUtils {
+  /**
+   * The profile directory.
+   */
+  [Throws, BinaryName="ProfileDirSync"]
+  readonly attribute DOMString profileDir;
+
+  /**
+   * The local-specific profile directory.
+   */
+  [Throws, BinaryName="LocalProfileDirSync"]
+  readonly attribute DOMString localProfileDir;
+
+  /**
+   * The temporary directory for the process.
+   */
+  [Throws, BinaryName="TempDirSync"]
+  readonly attribute DOMString tempDir;
+
+  /**
+   * The OS temporary directory.
+   */
+  [Throws, BinaryName="OSTempDirSync"]
+  readonly attribute DOMString osTempDir;
+
+  /**
+   * The libxul path.
+   */
+  [Throws, BinaryName="XulLibraryPathSync"]
+  readonly attribute DOMString xulLibraryPath;
+};
+
+[Exposed=Worker]
+partial namespace PathUtils {
+  /**
+   * The profile directory.
+   */
+  [NewObject, BinaryName="GetProfileDirAsync"]
+  Promise<DOMString> getProfileDir();
+
+  /**
+   * The local-specific profile directory.
+   */
+  [NewObject, BinaryName="GetLocalProfileDirAsync"]
+  Promise<DOMString> getLocalProfileDir();
+
+  /**
+   * The temporary directory for the process.
+   */
+  [NewObject, BinaryName="GetTempDirAsync"]
+  Promise<DOMString> getTempDir();
+
+  /**
+   * The OS temporary directory.
+   */
+  [NewObject, BinaryName="GetOSTempDirAsync"]
+  Promise<DOMString> getOSTempDir();
+
+  /**
+   * The libxul path.
+   */
+  [NewObject, BinaryName="GetXulLibraryPathAsync"]
+  Promise<DOMString> getXulLibraryPath();
+};
+
+dictionary SplitRelativeOptions {
+  /** Allow for a path that contains empty components. */
+  boolean allowEmpty = false;
+
+  /** Allow for a path that contains ".." components. */
+  boolean allowParentDir = false;
+
+  /** Allow for a path that contains "." components. */
+  boolean allowCurrentDir = false;
+};