After merging in the new icons here is still things left to be done:

• Breakpoint hint decoration takes priority over regular breakpoint decoration. If a user hover over breakpoint it should show that decoration, not the transaparent one. For this we would need the breakpoint-hint icon back, since otherwise it is hard for me to prioritize css rules usch that this one is not respected
• Start icon in select box looks too big - compare it to debug toolbar
• Breakpoints have increased in size, let's decrease their size a bit
• Restart icon looks too large

fyi @chryw