I hope that a user style sheet is also acceptable here.
If you are worried too much by your reputation score, the following user style sheet for Firefox may ease your feeling. It hides your reputation score from the header 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). You may have to create the 〈PROFILE_DIRECTORY〉/chrome directory by yourself.