, the sane way

To sanitize the layout of, put this in your user stylesheet
(userContent.css in Mozilla/Firefox, use the ChromEdit extension).

/* deviantART: sanitize layout */
body#deviantART { padding: 2px 4px !important; margin: 0 !important; }
body#deviantART div#head h1 { padding: 0 !important; height: 20px !important; }
body#deviantART div#head h1 * {
    height: auto !important; padding: 0 !important; margin: 0 !important;
    font-size: 12pt !important; letter-spacing: 2px !important;
    font-weight: bold !important;
/* Remove ads */
body#deviantART div#sponsors { display: none; }
/* Move Journal / Settings / Profile links and Search box */
body#deviantART div#deviosity {
    position: absolute !important;
    top: 5px !important;
    left: 150px !important;
body#deviantART form#devart-search {
  position: absolute !important;
  top: -20px !important;
  right: 0px !important;
/* Remove Christmas bar */
body#deviantART div#bar-countdown { display: none !important; }

This sizes down the header, removes the ad block (though AdBlock is better for that),
and the christmas notice, and finally moves the deviosity block
(Journal | Profile | Settings) and search box back into the header.