XML file

<?xml version="1.0"?>
<stuff xmlns:abc="http://nothing.org/schema">
  <abc:TheTag>hey guys</abc:TheTag>
</stuff>
    

Live results

FF2

$('TheTag').length = 1
$('abc:TheTag').length = 0
    

FF3 RC1

$('TheTag').length = 0
$('abc:TheTag').length = 0
    

See the Firefox bug demo for this behavior change.

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