I've been contributing to Mozilla since mid-2009.
Currently I'm involved with SUMO as a Moderator/Contributor, I do some QA work on Test Days, Bug Days, Bug Triage and Verification days. Also doing some editing in the en-US SUMO Knowledge Base and am a reviewer for it.
You can find me in IRC under "moses" in the following channels. #sumomeet, #sumo, #sumodev,,#testday, #qa, #automation, #firefox