[CentOS] xulrunner 1.9.0.19-1: Does it exist or what?

According to 'yum info xulrunner' version 1.9.0.19, release 1.el5_5
exists and is an available package.  But when I try to update it, yum
claims there is nothing to do and when I try a general update, yum
complains that it cannot update firefox because it cannot find xulrunner
>= 1.9.0.19-1.  What is going on here?

I am doing this on a desktop x86_64 system that I recently brought up
to CentOS 5.5, using the DVD ISO I downloaded to my laptop.  I'd like
to finish this update, but I am having this strange problem.  I am
getting the same problem on my (i686) laptop.  I'm guessing that the
updates repos are presently broken?

-- 
Robert Heller             -- 978-544-6933
Deepwoods Software        -- Download the Model Railroad System
http://www.deepsoft.com/  -- Binaries for Linux and MS-Windows
heller at deepsoft.com       -- http://www.deepsoft.com/ModelRailroadSystem/