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
This new feature will only work in the "MBT", when devtools.browsertoolbox.fission is true. It is based on yet another preference, devtools.browsertoolbox.scope, which is meant to be toggle by DevTools UI only (see next patches). When the new pref is set to "everything", we will observe FRAME and PROCESS targets and so debug everything running in content processes. But when it is set to "parent-process", we will only observe WORKER and be restricted to parent process resources only. Differential Revision: https://phabricator.services.mozilla.com/D146891