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It'll be 1 at first. It's likely to then gradually be increased over time, probably to 2, then 4, maybe 8. Not sure about beyond that.

I'm currently working on reducing memory usage to help with this, because that's the main downside of increasing the content process count. There are all sorts of trade-offs here: performance, memory usage, address space usage, security, crash-resilience, and they all tug in different directions.

There's a bug open for basing it on the amount of cores and memory.

https://bugzilla.mozilla.org/show_bug.cgi?id=1066789

Yes, the conclusion of the link says so.

Where? I don't see any such conclusion. Mind quoting the relevant bit?

> Overall we see a 10-20% increase in memory usage for the 1 content process case (which is what we plan on shipping initially).