1 files changed, 23 insertions, 0 deletions
diff --git a/toolkit/modules/tests/browser/head.js b/toolkit/modules/tests/browser/head.js
new file mode 100644
index 000000000..777e087e1
--- /dev/null
+++ b/toolkit/modules/tests/browser/head.js
@@ -0,0 +1,23 @@
+function removeDupes(list)
+{
+  let j = 0;
+  for (let i = 1; i < list.length; i++) {
+    if (list[i] != list[j]) {
+      j++;
+      if (i != j) {
+        list[j] = list[i];
+      }
+    }
+  }
+  list.length = j + 1;
+}
+
+function compareLists(list1, list2, kind)
+{
+  list1.sort();
+  removeDupes(list1);
+  list2.sort();
+  removeDupes(list2);
+  is(String(list1), String(list2), `${kind} URLs correct`);
+}
+