diff --git a/client/js/libs/string.contains.js b/client/js/libs/string.contains.js
deleted file mode 100644
index ea1dde83..00000000
--- a/client/js/libs/string.contains.js
+++ /dev/null
@@ -1,18 +0,0 @@
-//
-// Check if string contains any of the supplied words.
-//
-// Usage:
-// "".contains(a, b, ...);
-//
-// Returns [true|false]
-//
-String.prototype.contains = function() {
-	var args = arguments;
-	for (var i in args) {
-		var str = args[i];
-		if (typeof str === "string" && this.indexOf(str) > -1) {
-			return true;
-		}
-	}
-	return false;
-}