That's strange, which OS? I am on Arch and also on 145 and I get the "Ask an AI Chatbot" in the context menu. The settings used to work in the past so I am not sure what's going on.

I believe these are all the settings I have disabled for AI:

browser.ml.chat.enabled

browser.ml.chat.menu

browser.ml.chat.page

browser.ml.chat.page.footerBadge

browser.ml.chat.page.menuBadge

browser.ml.chat.shortcuts

browser.ml.chat.sidebar

browser.ml.enable

browser.ml.linkPreview.enabled

browser.ml.pageAssist.enabled

browser.tabs.groups.smart.enabled

browser.tabs.groups.smart.userEnable

browser.tabs.groups.smart.userEnabled

extensions.ml.enabled

sidebar.notification.badge.aichat

Am I missing anything?