1 files changed, 46 insertions, 0 deletions
diff --git a/browser/extensions/webcompat/shims/microsoftVirtualAssistant.js b/browser/extensions/webcompat/shims/microsoftVirtualAssistant.js
new file mode 100644
index 0000000000..862bcd338e
--- /dev/null
+++ b/browser/extensions/webcompat/shims/microsoftVirtualAssistant.js
@@ -0,0 +1,46 @@
+/* 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/. */
+
+"use strict";
+
+/**
+ * Bug 1801277 - Shim Microsoft virtual assistant.
+ *
+ * The microsoft virtual assistant will break when accessing the indexedDB that
+ * will throw a security error because the virtual assistant is under a
+ * third-party tracking domain 'liveperson.net'. The shim replaces the indexedDB
+ * with a fake interface that won't throw an error.
+ */
+
+/* globals cloneInto */
+
+(function() {
+  const win = window.wrappedJSObject;
+
+  try {
+    // We only replace the indexedDB when liveperson.net is loaded in a
+    // third-party context. Note that this is not strictly correct because
+    // this is a cross-origin check but not a third-party check.
+    if (win.parent == win || win.location.origin == win.top.location.origin) {
+      return;
+    }
+  } catch (e) {
+    // If we get a security error when accessing the top-level origin, this
+    // shows that the window is in a cross-origin context. In this case, we can
+    // proceed to apply the shim.
+    if (e.name != "SecurityError") {
+      throw e;
+    }
+  }
+
+  const emptyMsg = cloneInto({ message: "" }, window);
+
+  const idb = {
+    open: () => win.Promise.reject(emptyMsg),
+  };
+
+  Object.defineProperty(win, "indexedDB", {
+    value: cloneInto(idb, window, { cloneFunctions: true }),
+  });
+})();