How do I stop FireFox from discreetly installing updates, which removes the bookmarks and seetings?

It happens with out my knowledge. This leads me to lose my bookmarks, settings and is such a nuisance. How do I stop FireFox from losing my settings and bookmarks? Thank you. Suggested Reading: Discovering the Internet: Complete Concepts and Techniques (Shelly Cashman)DISCOVERING THE INTERNET: COMPLETE CONCEPTS AND TECHNIQUES, Third Edition provides a hands-on introduction [...]