From cb105bc799f112e1b36930d7add73a343c3b4a99 Mon Sep 17 00:00:00 2001
From: UncleBill
Date: Mon, 15 Apr 2013 23:59:18 +0800
Subject: fix issue #772

---
 CREDITS                        | 1 +
 background_scripts/main.coffee | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/CREDITS b/CREDITS
index 36e75f47..605860fe 100644
--- a/CREDITS
+++ b/CREDITS
@@ -39,5 +39,6 @@ Contributors:
   Wang Ning <daning106@gmail.com> (github:daning)
   Werner Laurensse (github: ab3)
   Timo Sand <timo.j.sand@gmail.com> (github: deiga)
+  Shiyong Chen <billbill290@gmail.com> (github: UncleBill)
 
 Feel free to add real names in addition to GitHub usernames.
diff --git a/background_scripts/main.coffee b/background_scripts/main.coffee
index c750162e..14e08533 100644
--- a/background_scripts/main.coffee
+++ b/background_scripts/main.coffee
@@ -90,6 +90,8 @@ root.addExcludedUrl = (url) ->
   return unless url = url.trim()
 
   excludedUrls = Settings.get("excludedUrls")
+  return unless excludedUrls.indexOf(url) < 0
+
   excludedUrls += "\n" + url
   Settings.set("excludedUrls", excludedUrls)
 
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