ここがうまく表示されないのですがFirefoxのバグですね？
http://www.microsoft.com/library/shared/deeptree/asp/deeptreeDL.asp?stcfg=/japan/msdn/library/searchtabconfig.xml&dtcfg=/japan/msdn/library/deeptreeconfig.xml&url=/japan/msdn/library/startpage.asp?frame=true