Using gist because it delivers https!

Assembla Userstyle

@namespace url(http://www.w3.org/1999/xhtml);

@-moz-document domain("assembla.com") {
  #header-w, #main-menu-w, .menu-wrapper {
     background-color: #222 !important
  }
  
  ul#main-menu li, .more_tabs_menu_item {
     background-color: #900 !important
  }
    
  ul#main-menu li a:link, ul#main-menu li a:visited, .more_tabs_menu_item a:link, .more_tabs_menu_item a:visited {
    color: #fff !important;
    border-top: 1px solid #a00 !important;

  }
  
  ul#main-menu li.current a:link, ul#main-menu li.current a:visited  {
    color: #000 !important;
    border-top: 1px solid #222 !important;

  }
  
  ul#main-menu li a:hover, ul#main-menu li a:active,.more_tabs_menu_item:hover, .more_tabs_menu_item:active {
    background-color: #b00;
    border-top: 1px solid #f00 !important;
    text-decoration: underline !important;
  }
  
  h1.header-w, #space-role, #user-box, #user-box a {
    color: #888 !important;
  }
  #user-box img {
    display: none
  }
  #logo a img {
    visibility: hidden
  }
  #logo a {
    background-color: #333;
    background-image: url(http://cdn.thatapp.net/assembla/assembla-logo-small.png);
    background-repeat: no-repeat;
    height: 25px; 
    display: block;
    width: 90px;
    margin-bottom: 10px !important
  }
  ul#main-menu li.search-field {
    background-color: transparent !important;
  }

ul#main-menu li.search-field input {
    background-color: #e7e7e7 !important;
  }
ul#main-menu li.search-field input:focus {
    background-color: #fff !important;
  }

  .blue-box-title {
    background-color: #e7e7e7 !important;
  }
#space-desc {
  font-size: 16pt !important
}
  .ticket_row {
    font-family: Menlo, monospaced;
  }
  .ticket_row td {
    padding: 5px !important;
  }
  .ticket_row td a {
    color: #666 !important;
  }

td.summary a {
  color: #000 !important;
 }
  .menu-submenu a:link, .menu-submenu a:visited {
  color: #444 !important;
  padding-top: 5px !important;
  padding-bottom: 5px !important;
}
.menu-submenu a:hover, .menu-submenu a:active {
  color: #000 !important;
  text-decoration: underline !important;
  background-color: rgba(255,255,50,0.2);
}
.menu-submenu {
  padding-top: 0 !important;
  height: 29px !important;
}
ul.menu-submenu li .selected {
  background-position: center 30px !important;
}
.u-stream td {
  padding: 8px 0 !important
}
.scrum-box {
  font-family: Menlo, monospaced;
}
.scrum-report {
  border-top: 1px solid #ccc !important;
  border-bottom: 1px solid #ccc !important;
}
.report-header {
  background-color: #eee !important;
}
.report-header a {
  font-size: 13pt !important
}
}