94a2b65fb1
This change makes all browsers which were not created with an initial `remote` attribute within a non-`useRemoteTabs` window be unable to process-switch, as otherwise we may attempt to switch loads into a content process. We need to keep process switching enabled for explicitly-remote browsers loaded in a non-`useRemoteTabs` window as it's relied on for tests and can lead to assertion failures due to loading remote content in the parent process. Differential Revision: https://phabricator.services.mozilla.com/D121285