Groepenb2g, coding, sf-monument, support, webapps
Great Brazilian Mozillian
Offers support on IRC and lists, helps organize events and more.
Ricardo Luis Zanetti Panaggio
Bruno Vilar is an active contributor in several different areas.
He helps a lot in support for Firefox OS App development, offering support on Mozilla Brasil channels like IRC and mailing list and on support forums.
He's spreading the word about Firefox OS on the web and on events. His presence on events like FISL15 was really important.
He's also responsible for the welcoming of several new contributors, which made the difference in many cases between just showing up and sticking to it