I was wondering why I was running low on memory, then noticed Firefox.

Heap textures seems rather large (can't drill down any).  I don't have that 
many tabs open (Window1 3 + Window2 2) for a total of 5.  CC/GC didn't help 
any.  I also closed the only tab that might be heavy on the graphics.  I did 
have the dev tools open for a while with Log Request and Response Bodies turned 
on.

Any ideas?

Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:30.0) Gecko/20100101 Firefox/30.0

4,783.33 MB (100.0%) -- explicit
├──4,073.86 MB (85.17%) -- gfx
│  ├──4,073.18 MB (85.15%) ── heap-textures
│  └──────0.68 MB (00.01%) ++ (5 tiny)
├────185.48 MB (03.88%) -- js-non-window
│    ├──145.96 MB (03.05%) -- zones
│    │  ├──102.89 MB (02.15%) ++ zone(0x76cb800)
│    │  └───43.07 MB (00.90%) ++ (31 tiny)
│    └───39.52 MB (00.83%) ++ (2 tiny)
├────182.37 MB (03.81%) -- window-objects
│    ├───67.81 MB (01.42%) -- top(none)/detached
│    │   ├──63.47 MB (01.33%) ++ window(chrome://browser/content/browser.xul)
│    │   └───4.34 MB (00.09%) ++ (5 tiny)
│    ├───60.18 MB (01.26%) ++ (10 tiny)
│    └───54.39 MB (01.14%) ++ top([URL], id=1954)
├────134.19 MB (02.81%) -- heap-overhead
│    ├──131.69 MB (02.75%) ── waste
│    └────2.50 MB (00.05%) ++ (2 tiny)
├────114.44 MB (02.39%) ++ (21 tiny)
└─────92.99 MB (01.94%) ── heap-unclassified


        0.22 MB ── canvas-2d-pixels
        0.00 MB ── gfx-d2d-surface-cache
        4.00 MB ── gfx-d2d-surface-vram
      208.90 MB ── gfx-d2d-vram-draw-target
        5.34 MB ── gfx-d2d-vram-source-surface
        1.38 MB ── gfx-surface-win32
        0.00 MB ── gfx-textures
              0 ── ghost-windows
    4,394.14 MB ── heap-allocated
    4,528.33 MB ── heap-committed
          3.05% ── heap-overhead-ratio
              0 ── host-object-urls
        0.00 MB ── imagelib-surface-cache
       24.58 MB ── js-main-runtime-temporary-peak
    5,082.21 MB ── private
    5,221.40 MB ── resident
    6,651.32 MB ── vsize
8,376,692.50 MB ── vsize-max-contiguous
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