With a lower version of Firefox 1.5.0.1! The Yum updated 1.0.5.7 is no good. Delete all files in ~/.mozilla, then Add/Remove Software, click on List, choose remove all Graphic Web Applications -> Apply, then restart Add/Remove Software, click on add all Graphic Web Application...
A good news: I finally updated my system via yum and package management tool. I deleted many unuseful packages such as Eclipse and Korean font. Then I got 300mb free space. After that I updated my kernel, and restart. Done! Now my kernel is:
[root@localhost /]# uname -a
Linux...