User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.4) Gecko/20060615 Firefox/1.5.0.4 Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.4) Gecko/20060615 Firefox/1.5.0.4 The tree "threadTree" defined in messenger.xul does not set an ID for its treecols element. Consequently, it is hard to write an extension that adds a new column in the message list. Several people have stumbled on this problem. The following message describes the problem in greater details: http://www.xulplanet.com/forum/viewtopic.php?t=2081 Reproducible: Always David Bienvenu might be interested about this bug, since he provided extensive information about doing what I'm trying to do.

You need to patch against cvs using `cvs diff'. I would also suggest using the '-u8p' options. Also, you need to request review for the patch. I'd suggets Scott MacGregor (mscott@mozilla.org).

Comment on attachment 229975 [details] [diff] [review] Remade patch as suggested in comment #2 Thanks for the patch. And props to Adam for fostering this along. Let me know if you need someone to check this in.

> Let me know if you need someone to check this in. I'd appreciate it. Thank you!

Seems the patch never made it in, but a similar fix was included by bug 348504.