I might never get around to flipping whatever kill switch they claim to be working on, so I’m turning off as much as I can now

For the record a quick web search for how to disable AI in firefox gave me this list of items to set to false in about:config :

browser.ml.enable
browser.ml.chat.enabled
browser.ml.chat.sidebar
browser.ml.chat.shortcuts
browser.ml.chat.page.footerBadge
browser.ml.chat.page.menuBadge
browser.ml.linkPreview.enabled
browser.tabs.groups.smart.enabled
extensions.ml.enabled