Fix dropdown toggle in Firefox
Fix dropdown toggle in Firefox

jleft/d3fc-showcase,ScottLogic/d3fc-showcase,ScottLogic/d3fc-showcase,ScottLogic/d3fc-showcase,jleft/BitFlux,jleft/BitFlux,jleft/d3fc-showcase,ScottLogic/BitFlux,jleft/d3fc-showcase,ScottLogic/BitFlux