Translation of Mittelfeldspieler

Can you translate: Are you using the firefox browser? Install this tool in your browser window. The ones I suggested the other day are the most useful ones, because we would use it for generic terms which differ from Spanish.
Well, you're already here ... would you ever have thought that I'm a member in facebook? You are a funny guy. What else is happening? Did you already settle down in your new country of choice?
Maybe you can tell me a little about yourself. My hobbies are reading, sports, meet with friends, but mostly I like to travel. I've been around the world ... in all the five continents.