Selecting view /hidden files show hundreds of files in the home directory. Is this a problem?
No, they are hidden for a reason, so they don't clutter up your /home dir. All they do is hold your config settings for a program that's related to the "dot file". If you delete that dot file it reappear when you launch the program again. ie. If you deleted the .mozilla file all your setting will be gone bookmarks, personal settings etc. When you launch mozilla again it'll create a new dot file in your /home dir with the default settings.