chkrootkit发现可疑文件，正常吗？

Question

我的系统是：ubuntu 8.10 desktop，运行chkrootkit时，报了一些可疑文件，是否表明系统已经有问题了？
＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
guo@bajia001:~$ sudo chkrootkit -q
[sudo] password for guo:
The following suspicious files and directories were found:
/usr/lib/firefox-3.0.4/.autoreg /usr/lib/xulrunner-1.9.0.4/.autoreg /lib/init/rw/.ramfs /lib/modules/2.6.27-7-generic/volatile/.mounted

eth0: PROMISC
user guo deleted or never logged from lastlog!
guo@bajia001:~$
＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
接下来应该怎么做？各位有何建议？ 谢谢！！！

Answer 1

firefox下的应该是插件