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This is multiprocess, but not process-per-tab. There is still a single rendering process for all tabs, at least for now.

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But the ultimate plan seems to be to have process-per-tab. The article states: "In future iterations, we expect every browser tab to run in its own process."

There's some interesting talk about that in mozilla.dev.platform: https://groups.google.com/forum/#!topic/mozilla.dev.platform...

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