- It runs locally without consuming too much energy or phoning home,
- it can be completely disabled without being re-enabled after an update,
- its training set is ethically sourced and the manifest of training sources is publicly accessible (I'm fine with the training data not being accessible as long as it's properly marked in the manifest),
- and the weights and training code are open,
I would be fine having some sort of AI model available as assistant in FF. I probably wouldn't use it, but I wouldn't have any problems with it being there.