Pour désactiver les fonctions d'IA dans FF :

about:config
browser.ml.chat.enabled -> false
browser.tabs.groups.smart.enabled -> false
browser.ml.enable -> false

(via plein de shaarli différents)

Edit : plus complet
browser.ml.chat.enabled = false
browser.ml.chat.shortcuts = false
browser.ml.chat.shortcuts.custom = false
browser.ml.chat.sidebar = false
browser.ml.enable = false
extensions.ml.enabled = false

browser.tabs.groups.smart.enabled = false
browser.tabs.groups.smart.optin = false
browser.tabs.groups.smart.userEnabled = false