Firefox OS does use Spidermonkey's JIT compiler to run apps, but it runs each web app in a separate low-privilege process, to mitigate damage that a compromised

Firefox OS does use Spidermonkey's JIT compiler to run apps, but it runs each web app in a separate low-privilege process, to mitigate damage that a compromised app might do: https://wiki.mozilla.org/B2G/Architecture/Runtime_Security https://wiki.mozilla.org/B2G/Architecture/Runtime_Security