Yes, there are good use cases for supporting this in extensions. We have an experiment in the works (project Bergamot, on mana) that depends on this functionality for good performance. For the time being, I think it would be OK to put SAB-in-extensions behind a pref if people are nervous / uncertaint, but we may come to depend on this long-term.
Bug 1674383 Comment 8 Edit History
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Yes, there are good use cases for supporting this in extensions. We have an experiment in the works (project Bergamot, on mana) that depends on this functionality for good performance. For the time being, I think it would be OK to put SAB-in-extensions behind a pref if people are nervous / uncertain, but we may come to depend on this long-term.