Not just e10s, they also need to enable the sandboxing, i.e. it requires Firefox 50 at least. It should actually be easier for Tor to enable stricter sandboxin

Not just e10s, they also need to enable the sandboxing, i.e. it requires Firefox 50 at least. It should actually be easier for Tor to enable stricter sandboxing than in the default Firefox, though, as presumably they have to care less about compatibility.