I downloaded and fired up Firefox Nightly (2026-02-03) to test the #AI "kill switch" to see how it works.
So far, so good. It does appear that the "kill switch" disables the settings that people are turning off in about.config. See 5 screenshots below.
Also, Mozilla has published a support article detailing how to disable the #AI features:
Additional screenshots from Firefox Nightly, 2026-02-03
IMPORTANT CAVEAT about Mozilla's KB article about the #AI "kill switch":
"The AI controls do not include some Firefox features that rely on traditional machine learning, as well as features that are controlled by third parties."
Think: Firefox Suggest, Mozilla Sponsored Content, etc.
Link (same one I posted at top of thread): https://support.mozilla.org/en-US/kb/firefox-ai-controls
@scottwilson Are the features opt-in or out? It seemed like there was some confusion on that point. Last I saw was that the features were visible, but not activated without user consent.
@mttaggart Well, they are opt-out. So when you launch Firefox, all the AI options are ENABLED.
I will say, disabling them is very clear and not a huge lift. Of course, it'd be nicer if the functions were opt-in.
