I've filed bug 1151672 [1] with full memory reports attached. I've CC'd some people who might be interested but feel free to add more. It seems that bug 1151672 [2] is responsible for most of the USS increase but I've spotted some other issues outside of that, some of which look like genuine regressions.
Gabriele [1] Major memory usage regressions in v3.0 https://bugzilla.mozilla.org/show_bug.cgi?id=1162535 [2] Preallocated process approach not working on 2.2 and 3.0 https://bugzilla.mozilla.org/show_bug.cgi?id=1151672
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