Comment by Twirrim

Searching about:flags for model comes up with a whole bunch:

#omnibox-ml-url-scoring-model

#omnibox-on-device-tail-suggestions

#optimization-guide-on-device-model

#text-safety-classifier

#prompt-api-for-gemini-nano

#writer-api-for-gemini-nano

#rewriter-api-for-gemini-nano

#proofreader-api-for-gemini-nano

#summarizer-api-for-gemini-nano

#on-device-model-litert-lm-backend

Then around gemini but not caught by the search for models: #skills (maybe? I think this is implied by "gemini in chrome"?)

edit: I don't see a carte blanch AI disabling option. As much as I dislike Mozilla's growing obsession with AI, at least they give me a top level option to disable all AI stuff. I only keep Chrome around for occasional testing reasons.