I'm not familiar enough with our in-process isolation to summarize it, but https://wiki.mozilla.org/Security/Sandbox https://wiki.mozilla.org/Security/Sandbox i

I'm not familiar enough with our in-process isolation to summarize it, but https://wiki.mozilla.org/Security/Sandbox https://wiki.mozilla.org/Security/Sandbox is an good trailhead for the process-level sandboxing in Firefox.