Because Firefox users have been clamoring for the ability to turn them off rather than the opposite.
I think you misunderstand. Firefox users have wanted this to be opt-in or explicit-choice rather than opt-out.
The implication is that all future AI features will be opt-out.
I think they're asking why it has to be opt-out rather than opt-in.
I think you misunderstand. Firefox users have wanted this to be opt-in or explicit-choice rather than opt-out.
The implication is that all future AI features will be opt-out.