Issue #2886904 by jhodgdon, andrewmacpherson, volkerk, Eric Heydrich, Vidushi...

Issue #2886904 by jhodgdon, andrewmacpherson, volkerk, Eric Heydrich, Vidushi Mehta, Utkarsh_Mishra, jenlampton, hosef, anavarre, adriancid, xjm, alexpott, mgerbault, tracipotocnik, BSpeel, yoroy, lauriii: display: block for details/summary hides drop arrows in Firefox (normalize.css update)