diff --git a/mozilla/toolkit/components/feeds/src/FeedProcessor.js b/mozilla/toolkit/components/feeds/src/FeedProcessor.js
index 3d36eb0bab8..8116cf1cfb1 100644
--- a/mozilla/toolkit/components/feeds/src/FeedProcessor.js
+++ b/mozilla/toolkit/components/feeds/src/FeedProcessor.js
@@ -481,7 +481,7 @@ Entry.prototype = {
       var isPermaLink = true;
       
       if (bagHasKey(guid, "isPermaLink"))
-        isPermaLink = new Boolean(guid.getProperty("isPermaLink"));
+        isPermaLink = guid.getProperty("isPermaLink").toLowerCase() != "false";
       
       if (guid && isPermaLink)
         this.link = strToURI(guid.getProperty("guid"));
diff --git a/mozilla/toolkit/components/feeds/test/xml/rss2/item_guid_isPermaLink_false.xml b/mozilla/toolkit/components/feeds/test/xml/rss2/item_guid_isPermaLink_false.xml
new file mode 100644
index 00000000000..c2a1ad867db
--- /dev/null
+++ b/mozilla/toolkit/components/feeds/test/xml/rss2/item_guid_isPermaLink_false.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!--
+
+Description: item guid should not map to link when isPermaLink=false
+Expect: var link = feed.items.queryElementAt(0, Components.interfaces.nsIFeedEntry).link; link == null;
+
+-->
+<rss version="2.0" >
+<channel>
+<item>
+
+<enclosure length="24986239" type="audio/mpeg" url="http://dallas.example.com/joebob_050689.mp3" /> 
+<author>jbb@dallas.example.com (Joe Bob Briggs)</author>
+<title>test</title>
+<guid isPermaLink="false">http://www.example.org/</guid>
+<category domain="foo">bar</category>
+
+<description>I'm headed for France. I wasn't gonna go this year, but then last week &lt;a href="http://www.imdb.com/title/tt0086525/"&gt;Valley Girl&lt;/a&gt; came out and I said to myself, Joe Bob, you gotta get out of the country for a while.</description></item>
+</channel>
+</rss>
diff --git a/mozilla/toolkit/components/feeds/test/xml/rss2/item_guid_isPermaLink_false_uppercase.xml b/mozilla/toolkit/components/feeds/test/xml/rss2/item_guid_isPermaLink_false_uppercase.xml
new file mode 100644
index 00000000000..9ff2505c485
--- /dev/null
+++ b/mozilla/toolkit/components/feeds/test/xml/rss2/item_guid_isPermaLink_false_uppercase.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!--
+
+Description: item guid should not map to link when isPermaLink=FaLsE
+Expect: var link = feed.items.queryElementAt(0, Components.interfaces.nsIFeedEntry).link; link == null;
+
+-->
+<rss version="2.0" >
+<channel>
+<item>
+
+<enclosure length="24986239" type="audio/mpeg" url="http://dallas.example.com/joebob_050689.mp3" /> 
+<author>jbb@dallas.example.com (Joe Bob Briggs)</author>
+<title>test</title>
+<guid isPermaLink="FaLsE">http://www.example.org/</guid>
+<category domain="foo">bar</category>
+
+<description>I'm headed for France. I wasn't gonna go this year, but then last week &lt;a href="http://www.imdb.com/title/tt0086525/"&gt;Valley Girl&lt;/a&gt; came out and I said to myself, Joe Bob, you gotta get out of the country for a while.</description></item>
+</channel>
+</rss>
diff --git a/mozilla/toolkit/components/feeds/test/xml/rss2/item_guid_isPermaLink_true_uppercase.xml b/mozilla/toolkit/components/feeds/test/xml/rss2/item_guid_isPermaLink_true_uppercase.xml
new file mode 100644
index 00000000000..bc4fdc0e943
--- /dev/null
+++ b/mozilla/toolkit/components/feeds/test/xml/rss2/item_guid_isPermaLink_true_uppercase.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!--
+
+Description: item guid should map to link when isPermaLink=TrUe
+Expect: var link = feed.items.queryElementAt(0, Components.interfaces.nsIFeedEntry).link; link.spec == "http://www.example.org/";
+
+-->
+<rss version="2.0" >
+<channel>
+<item>
+
+<enclosure length="24986239" type="audio/mpeg" url="http://dallas.example.com/joebob_050689.mp3" /> 
+<author>jbb@dallas.example.com (Joe Bob Briggs)</author>
+<title>test</title>
+<guid isPermaLink="TrUe">http://www.example.org/</guid>
+<category domain="foo">bar</category>
+
+<description>I'm headed for France. I wasn't gonna go this year, but then last week &lt;a href="http://www.imdb.com/title/tt0086525/"&gt;Valley Girl&lt;/a&gt; came out and I said to myself, Joe Bob, you gotta get out of the country for a while.</description></item>
+</channel>
+</rss>
diff --git a/mozilla/toolkit/components/feeds/test/xml/rss2/item_guid_isPermaLink_unknown_value.xml b/mozilla/toolkit/components/feeds/test/xml/rss2/item_guid_isPermaLink_unknown_value.xml
new file mode 100644
index 00000000000..4dce8c390fd
--- /dev/null
+++ b/mozilla/toolkit/components/feeds/test/xml/rss2/item_guid_isPermaLink_unknown_value.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!--
+
+Description: item guid should map to link when isPermaLink=meatcake or other unknown values
+Expect: var link = feed.items.queryElementAt(0, Components.interfaces.nsIFeedEntry).link; link.spec == "http://www.example.org/";
+
+-->
+<rss version="2.0" >
+<channel>
+<item>
+
+<enclosure length="24986239" type="audio/mpeg" url="http://dallas.example.com/joebob_050689.mp3" /> 
+<author>jbb@dallas.example.com (Joe Bob Briggs)</author>
+<title>test</title>
+<guid isPermaLink="meatcake">http://www.example.org/</guid>
+<category domain="foo">bar</category>
+
+<description>I'm headed for France. I wasn't gonna go this year, but then last week &lt;a href="http://www.imdb.com/title/tt0086525/"&gt;Valley Girl&lt;/a&gt; came out and I said to myself, Joe Bob, you gotta get out of the country for a while.</description></item>
+</channel>
+</rss>