GFX Layers dump visualizer:

Paste your display list or layers dump into this textarea:

ClientLayerManager (0x1264f5000)
  ClientContainerLayer (0x1263fe200) [visible=< (x=0, y=0, w=1457, h=1163); >] [opaqueContent] [metrics0={ [cb=(x=0.000000, y=0.000000, w=1457.000000, h=1163.000000)] [sr=(x=0.000000, y=0.000000, w=1457.000000, h=1163.000000)] [s=(0,0)] [dp=(x=0.000000, y=0.000000, w=1457.000000, h=1163.000000)] [cdp=(x=0.000000, y=0.000000, w=0.000000, h=0.000000)] [color=rgba(0, 0, 0, 0.000000)] [scrollId=3] [z=1] }]
    ClientTiledPaintedLayer (0x1263b3600) [bounds=(x=-1, y=0, w=1458, h=1163)] [visible=< (x=0, y=0, w=1457, h=79); >] { hitregion=< (x=0, y=0, w=1457, h=47); (x=-1, y=47, w=1458, h=24); (x=0, y=71, w=1457, h=1092); > dispatchtocontentregion=< (x=68, y=9, w=1375, h=31); (x=944, y=47, w=280, h=24); >} [opaqueContent] [valid=< (x=0, y=0, w=1457, h=79); >]
      SingleTiledContentClient (0x126f80680)
    ClientContainerLayer (0x122a33f00) [clip=(x=0, y=79, w=1457, h=1084)] [visible=< (x=0, y=79, w=1457, h=1084); >] [opaqueContent]
      ClientTiledPaintedLayer (0x11e11a700) [bounds=(x=0, y=79, w=1457, h=1084)] [visible=< (x=0, y=79, w=1457, h=1084); >] { hitregion=< (x=0, y=79, w=1457, h=1084); > dispatchtocontentregion=< (x=0, y=125, w=1457, h=1034); >} [opaqueContent] [valid=< (x=0, y=79, w=1457, h=1084); >]
        SingleTiledContentClient (0x1226d52c0)

Help: To get a layers dump go to about:config and set layout.display-list.dump;true or layers.dump;true.