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about:memory usage with 3 tabs open
Privileged Content (pid 82944)
Explicit Allocations
76.05 MB (100.0%) -- explicit
├──30.16 MB (39.66%) -- window-objects
│ ├───9.95 MB (13.08%) -- top(about:newtab, id=2147483669)
│ │ ├──6.63 MB (08.72%) -- active
│ │ │ ├──6.56 MB (08.62%) -- window(about:newtab)
│ │ │ │ ├──4.41 MB (05.80%) -- js-realm(about:newtab)
│ │ │ │ │ ├──1.84 MB (02.41%) -- baseline
│ │ │ │ │ │ ├──1.62 MB (02.13%) ── fallback-stubs
│ │ │ │ │ │ └──0.22 MB (00.29%) ── data
│ │ │ │ │ ├──1.33 MB (01.75%) ++ classes
│ │ │ │ │ └──1.25 MB (01.64%) ++ (8 tiny)
│ │ │ │ ├──1.93 MB (02.54%) ++ layout
│ │ │ │ └──0.22 MB (00.29%) ++ (3 tiny)
│ │ │ └──0.07 MB (00.10%) ++ window(about:blank)
│ │ ├──3.22 MB (04.24%) -- js-zone(0x121c44000)
│ │ │ ├──1.37 MB (01.80%) ++ (12 tiny)
│ │ │ ├──1.00 MB (01.31%) ── type-pool
│ │ │ └──0.86 MB (01.13%) ++ shapes
│ │ └──0.09 MB (00.12%) ++ js-zone(0x126c95000)
│ ├───7.49 MB (09.84%) -- top(about:newtab, id=2147483666)
│ │ ├──5.48 MB (07.20%) -- active/window(about:newtab)
│ │ │ ├──3.14 MB (04.12%) -- js-realm(about:newtab)
│ │ │ │ ├──1.61 MB (02.11%) ++ (7 tiny)
│ │ │ │ └──1.53 MB (02.01%) ++ classes
│ │ │ ├──2.12 MB (02.78%) ++ layout
│ │ │ └──0.23 MB (00.30%) ++ (3 tiny)
│ │ └──2.01 MB (02.64%) ++ js-zone(0x1040ae000)
│ ├───6.48 MB (08.52%) -- top(about:newtab, id=2147483658)
│ │ ├──4.59 MB (06.03%) -- active/window(about:newtab)
│ │ │ ├──2.20 MB (02.89%) -- js-realm(about:newtab)
│ │ │ │ ├──1.58 MB (02.08%) ++ classes
│ │ │ │ └──0.61 MB (00.81%) ++ (5 tiny)
│ │ │ ├──2.16 MB (02.84%) ++ layout
│ │ │ └──0.23 MB (00.30%) ++ (3 tiny)
│ │ └──1.89 MB (02.49%) ++ js-zone(0x11e8f1000)
│ └───6.25 MB (08.22%) -- top(about:home, id=2147483649)
│ ├──4.40 MB (05.79%) -- active/window(about:home)
│ │ ├──2.23 MB (02.93%) -- js-realm(about:home)
│ │ │ ├──1.60 MB (02.11%) ++ classes
│ │ │ └──0.62 MB (00.82%) ++ (5 tiny)
│ │ ├──1.96 MB (02.58%) ++ layout
│ │ └──0.22 MB (00.28%) ++ (3 tiny)
│ └──1.85 MB (02.43%) ++ js-zone(0x105039000)
├──20.52 MB (26.98%) ── heap-unclassified
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