How do I PERMANENTLY hide the AI bar... I mean side bar?

Dear Firefox Every few days the sidebar reappears. I DO NOT WANT to use the AI chatbot. Having tabs from other devices is all that useful to me. It feels like something that's just there to justify the AI chatbot bar existing. I can access bookmarks and history from the toolbar. Don't need a new sidebar for that. They don't justify your stupid AI chatbot bar. I DO NOT WANT TO USE YOUR AI CHATBOT. YOUR SIDEBAR IS LITERRALY NO DIFFERENT FROM A POP UP ADVERT. SO STOP HAVING IT POP UP AGAIN AND AGAIN.