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Does this OOM killer direction respect cgroup memory limits? Back when I was using Firefox on a low memory system, I ran it in a limited cgroup, but features like `browser.tabs.unloadOnLowMemory` wouldn't unload tabs on low cgroup memory, but only on low total system memory.

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Yes it does, we've disabled tab unloading on Linux because low-memory detection just didn't work. We will re-enabled it sometimes down the line but only to avoid swap, not crashes. The OOM killer does already a good job with this change and we feel no need to do anything further (besides optimizing memory usage, but that's system-agnostic).

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