about:addons tweak for Anonymous person -updated

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
/* AGENT SHEET */
#category-discover, #category-theme, #category-plugin, #category-service, #back-btn, #forward-btn, #header{
  display:none;
}

#addons-page{
  /*background: white !important;*/
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAMAAAADCAIAAADZSiLoAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH3gEWExECD0WpGQAAAB1pVFh0Q29tbWVudAAAAAAAQ3JlYXRlZCB3aXRoIEdJTVBkLmUHAAAAJElEQVQI12N4fOfpv7////39z/jv738GBoan958x/Pv7HyIMAFaRFtZMgqrRAAAAAElFTkSuQmCC);
}

.content-container{
  min-height: 37px !important;
  max-height: 37px !important;
}

.control-container {
  margin-top: -37px !important;
}

.description{
  margin-top: -5px !important;
}

.details.button-link{
  margin-top: -5px !important;
}

#view-port-container, #category-userstyle, #category-greasemonkey-user-script, #category-extension {
border-radius: 0 !important;
}