can you help me with my browser problem?

[Edward]

Im currently using opera and i have no plans of switching to chrome or mozilla. although there's this tiny problem everytime I go to my facebook page. Whenever I scroll down, the whole blue bar on top of the facebook page Where your picture is, the home button, the profile button, and the logout button is located) goes down with it, so whenever i want to go back to see my notifications I have to scroll all the way back up just to see it. Does anyone know what the problem is? Thank you for those who will answer