Disable AI in Firefox

"If you’d like to turn these features off, open about:config in the Firefox address bar, search for browser.ml.enable, set it to false, and that should disable everything."

This is nice to know but in future versions of Firefox that single config switch (browser.ml.enable) will both change names and split into multiple sub-switches, most likely appearing in different pages of about:config.

These sub-switches will then not remain consistent.

Bank on it.

Mozilla's default setting is true. This is the tired, old "opt-out" tactic

Almost no one changes defaults, according to the experts

It's perverse to think about:config is doing favours for anyone except Mozilla and its business partners

Otherwise the defaults would be false, i.e., opt-in