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作者：PebbleChamp 於 April 20, 2009 發佈 · 永久網址

Umm, this add-on is not necessary. Thunderbird already has the capability of doing this w/o the add-on. All you have to do is go to: Tools->Options->Advanced->Config Editor, and then change the value of mailnews.thread_pane_column_unthreads to FALSE.