old_contents: // saves some loading time by loading most of the commonly-used
  // JBrowse modules at the outset
  require([
              'JBrowse/Browser',
              'JBrowse/ConfigAdaptor/JB_json_v1',
              'JBrowse/View/TrackList/Simple',
  
              // common stores
              'JBrowse/Store/Sequence/StaticChunked',
              'JBrowse/Store/SeqFeature/NCList',
              'JBrowse/Store/TiledImage/Fixed',
  
              // common track views
              'JBrowse/View/Track/Sequence',
              'JBrowse/View/Track/HTMLFeatures',
              'JBrowse/View/Track/FixedImage/Wiggle',
  
              'JBrowse/View/TrackList/Simple',
              'JBrowse/Store/TrackMetaData',
  
              'dojox/gfx/svg'
          ]);
  
new_contents: // saves some loading time by loading most of the commonly-used
  // JBrowse modules at the outset
  require([
              'JBrowse/Browser',
              'JBrowse/ConfigAdaptor/JB_json_v1',
              'JBrowse/View/TrackList/Simple',
  
              // common stores
              'JBrowse/Store/Sequence/StaticChunked',
              'JBrowse/Store/SeqFeature/NCList',
              'JBrowse/Store/TiledImage/Fixed',
  
              // common track views
              'JBrowse/View/Track/Sequence',
              'JBrowse/View/Track/HTMLFeatures',
              'JBrowse/View/Track/FixedImage/Wiggle',
              'JBrowse/View/Track/Wiggle',
              'JBrowse/View/Track/Wiggle/XYPlot',
              'JBrowse/View/Track/Wiggle/Density',
              'JBrowse/View/Track/Alignments',
              'JBrowse/View/Track/FeatureCoverage',
  
              'JBrowse/View/TrackList/Simple',
              'JBrowse/Store/TrackMetaData',
  
              'dojox/gfx/svg'
          ]);
  
subject: put a few more things in the base build bundle, speeding up load times