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diff --git a/components/osfile/modules/ospath_unix.jsm b/components/osfile/modules/ospath_unix.jsm
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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 obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Handling native paths.
+ *
+ * This module contains a number of functions destined to simplify
+ * working with native paths through a cross-platform API. Functions
+ * of this module will only work with the following assumptions:
+ *
+ * - paths are valid;
+ * - paths are defined with one of the grammars that this module can
+ *   parse (see later);
+ * - all path concatenations go through function |join|.
+ */
+
+"use strict";
+
+// Boilerplate used to be able to import this module both from the main
+// thread and from worker threads.
+if (typeof Components != "undefined") {
+  Components.utils.importGlobalProperties(["URL"]);
+  // Global definition of |exports|, to keep everybody happy.
+  // In non-main thread, |exports| is provided by the module
+  // loader.
+  this.exports = {};
+} else if (typeof module == "undefined" || typeof exports == "undefined") {
+  throw new Error("Please load this module using require()");
+}
+
+var EXPORTED_SYMBOLS = [
+  "basename",
+  "dirname",
+  "join",
+  "normalize",
+  "split",
+  "toFileURI",
+  "fromFileURI",
+];
+
+/**
+ * Return the final part of the path.
+ * The final part of the path is everything after the last "/".
+ */
+var basename = function(path) {
+  return path.slice(path.lastIndexOf("/") + 1);
+};
+exports.basename = basename;
+
+/**
+ * Return the directory part of the path.
+ * The directory part of the path is everything before the last
+ * "/". If the last few characters of this part are also "/",
+ * they are ignored.
+ *
+ * If the path contains no directory, return ".".
+ */
+var dirname = function(path) {
+  let index = path.lastIndexOf("/");
+  if (index == -1) {
+    return ".";
+  }
+  while (index >= 0 && path[index] == "/") {
+    --index;
+  }
+  return path.slice(0, index + 1);
+};
+exports.dirname = dirname;
+
+/**
+ * Join path components.
+ * This is the recommended manner of getting the path of a file/subdirectory
+ * in a directory.
+ *
+ * Example: Obtaining $TMP/foo/bar in an OS-independent manner
+ *  var tmpDir = OS.Constants.Path.tmpDir;
+ *  var path = OS.Path.join(tmpDir, "foo", "bar");
+ *
+ * Under Unix, this will return "/tmp/foo/bar".
+ *
+ * Empty components are ignored, i.e. `OS.Path.join("foo", "", "bar)` is the
+ * same as `OS.Path.join("foo", "bar")`.
+ */
+var join = function(...path) {
+  // If there is a path that starts with a "/", eliminate everything before
+  let paths = [];
+  for (let subpath of path) {
+    if (subpath == null) {
+      throw new TypeError("invalid path component");
+    }
+    if (subpath.length == 0) {
+      continue;
+    } else if (subpath[0] == "/") {
+      paths = [subpath];
+    } else {
+      paths.push(subpath);
+    }
+  }
+  return paths.join("/");
+};
+exports.join = join;
+
+/**
+ * Normalize a path by removing any unneeded ".", "..", "//".
+ */
+var normalize = function(path) {
+  let stack = [];
+  let absolute;
+  if (path.length >= 0 && path[0] == "/") {
+    absolute = true;
+  } else {
+    absolute = false;
+  }
+  path.split("/").forEach(function(v) {
+    switch (v) {
+    case "":  case ".":// fallthrough
+      break;
+    case "..":
+      if (stack.length == 0) {
+        if (absolute) {
+          throw new Error("Path is ill-formed: attempting to go past root");
+        } else {
+          stack.push("..");
+        }
+      } else {
+        if (stack[stack.length - 1] == "..") {
+          stack.push("..");
+        } else {
+          stack.pop();
+        }
+      }
+      break;
+    default:
+      stack.push(v);
+    }
+  });
+  let string = stack.join("/");
+  return absolute ? "/" + string : string;
+};
+exports.normalize = normalize;
+
+/**
+ * Return the components of a path.
+ * You should generally apply this function to a normalized path.
+ *
+ * @return {{
+ *   {bool} absolute |true| if the path is absolute, |false| otherwise
+ *   {array} components the string components of the path
+ * }}
+ *
+ * Other implementations may add additional OS-specific informations.
+ */
+var split = function(path) {
+  return {
+    absolute: path.length && path[0] == "/",
+    components: path.split("/")
+  };
+};
+exports.split = split;
+
+/**
+ * Returns the file:// URI file path of the given local file path.
+ */
+// The case of %3b is designed to match Services.io, but fundamentally doesn't matter.
+var toFileURIExtraEncodings = {';': '%3b', '?': '%3F', '#': '%23'};
+var toFileURI = function toFileURI(path) {
+  // Per https://url.spec.whatwg.org we should not encode [] in the path
+  let dontNeedEscaping = {'%5B': '[', '%5D': ']'};
+  let uri = encodeURI(this.normalize(path)).replace(/%(5B|5D)/gi,
+    match => dontNeedEscaping[match]);
+
+  // add a prefix, and encodeURI doesn't escape a few characters that we do
+  // want to escape, so fix that up
+  let prefix = "file://";
+  uri = prefix + uri.replace(/[;?#]/g, match => toFileURIExtraEncodings[match]);
+
+  return uri;
+};
+exports.toFileURI = toFileURI;
+
+/**
+ * Returns the local file path from a given file URI.
+ */
+var fromFileURI = function fromFileURI(uri) {
+  let url = new URL(uri);
+  if (url.protocol != 'file:') {
+    throw new Error("fromFileURI expects a file URI");
+  }
+  let path = this.normalize(decodeURIComponent(url.pathname));
+  return path;
+};
+exports.fromFileURI = fromFileURI;
+
+
+//////////// Boilerplate
+if (typeof Components != "undefined") {
+  this.EXPORTED_SYMBOLS = EXPORTED_SYMBOLS;
+  for (let symbol of EXPORTED_SYMBOLS) {
+    this[symbol] = exports[symbol];
+  }
+}