I use CentOS 5.5 as my Desktop OS. Cent OS is a very stable Linux OS and is widely used in servers worldwide. And yet my Firefox used to regularly crash. By crash I mean the machine freezes up completely. Only recourse is to either reboot it or somehow execute the kill command and wait for a very long period for it to get accidentally recognized. After investigating on this I found the solution and realized this is not just a CentOS issue but can occur in any Linux system.