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diff --git a/dom/chrome-webidl/MatchGlob.webidl b/dom/chrome-webidl/MatchGlob.webidl
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+++ b/dom/chrome-webidl/MatchGlob.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 obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Represents a simple glob pattern matcher. Any occurrence of "*" in the glob
+ * pattern matches any literal string of characters in the string being
+ * compared. Additionally, if created with `allowQuestion = true`, any
+ * occurrence of "?" in the glob matches any single literal character.
+ */
+[ChromeOnly, Exposed=Window]
+interface MatchGlob {
+  [Throws]
+  constructor(UTF8String glob, optional boolean allowQuestion = true);
+
+  /**
+   * Returns true if the string matches the glob.
+   */
+  boolean matches(UTF8String string);
+
+  /**
+   * The glob string this MatchGlob represents.
+   */
+  [Constant]
+  readonly attribute UTF8String glob;
+};