Christabel Khumalo from Mozilla Zimbabwe outlined various contribution opportunities available with Mozilla including coding in languages like Python, Django, C++, and JavaScript or contributing to web development, add-ons, user support, localization, metrics, teaching, advocacy, quality assurance, and more. Potential roles involve coding, web development, providing user support on Twitter or through the Mozilla Knowledge Base, helping translate Firefox into over 80 languages, using data to help decision making, teaching web coding and digital literacy, advocacy work, finding bugs, and participating in bug testing and verification days.