From 87329406557e39a3d3ca32f6060f4101bf369945 Mon Sep 17 00:00:00 2001
From: Doug Kearns <dougkearns@gmail.com>
Date: Tue, 1 Feb 2011 16:56:31 +1100
Subject: [PATCH] Don't attempt to expand non-existent abbreviations with
 Object property names.

---
 common/content/abbreviations.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/content/abbreviations.js b/common/content/abbreviations.js
index d5239992..aa8558a8 100644
--- a/common/content/abbreviations.js
+++ b/common/content/abbreviations.js
@@ -113,7 +113,7 @@ var Abbreviations = Module("abbreviations", {
      */
     get: function (mode, lhs) {
         let abbrevs = this.abbrevs[mode];
-        return abbrevs && abbrevs[lhs];
+        return abbrevs && abbrevs.hasOwnProperty(lhs) ? abbrevs[lhs] : null;
     },
 
     /**