From cb42274a4655a0de7b57edc75b6b29d05f947f57 Mon Sep 17 00:00:00 2001
From: Doug Kearns <dougkearns@gmail.com>
Date: Mon, 21 Dec 2015 02:25:59 +1100
Subject: [PATCH] Fall back to String#contains when #includes is not supported.

Changeover was FF40.
---
 common/modules/polyfill.jsm | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/common/modules/polyfill.jsm b/common/modules/polyfill.jsm
index a18acc43..829d7ef8 100644
--- a/common/modules/polyfill.jsm
+++ b/common/modules/polyfill.jsm
@@ -67,4 +67,8 @@
             for (let [i, value] of this.entries())
                 yield value;
         };
+
+    if (!String.prototype.includes)
+        String.prototype.includes = String.prototype.contains;
+
 }