I hope that a user CSS is also ok here.

If you are worried too much by your reputation score, the following [user CSS for Firefox](http://www.mozilla.org/unix/customizing.html#usercss) may ease your feeling.  It hides your reputation score from the bar at the top of every page.

    @-moz-document domain(stackexchange.com) {
      #topbar .reputation-score {
        display: none !important;
      }
    }

To use it, put it in the file `$PROFILE_DIRECTORY/chrome/userContent.css`, with `$PROFILE_DIRECTORY` substituted by your profile directory (not surprisingly).