I have faced a problem with my YouTube account

Hi Experts,
I have faced a problem with my YouTube account. I found all the elements in my inbox other than original format. I checked my channel and found an error: "Hello, you either have JavaScript turned off or an old version of Adobe's Flash Player.
Get the latest Flash player". Then I updated my Flash Player. I also restarted my Firefox but no result.
Have you any idea?
Please help me to solve the problem.
Thanks in advance.
