There is bizarre global auto-scroll behavior when expanding a cell to show its summary. On click, I would rather just expand the cell and leave everything else alone.

Also, the following CSS (with Stylish, for example) makes it way more readable:

.main-content-section { margin-top: 0; }

.navbar { height: auto; }

.filters-menu { height: auto !important; }

.source-filter-tab { margin: 1px 6px; }