how to disable AI features in firefox 148 at system wide level?

i have my own firefox.cfg located at /usr/lib/firefox/ i’m trying to disable ai features by defaults by adding those values pref(“browser.ai.control.default”, blocked); pref(“browser.ai.control.linkPreviewKeyPoints”, blocked); pref(“browser.ai.control.pdfjsAltText”, blocked); pref(“browser.ai.control.sidebarChatbot”, blocked); pref(“browser.ai.control.smartTabGroups”, blocked); pref(“browser.ai.control.translations”, blocked); but that doesn’t work the browser start but without every pref i put