A Mozilla acquisition of HIBP could look alot like Mozilla buying HIBP from them, and then bringing Troy on board for a period of time as an evangelist, and the nature of being an open source, community focused org means that Troy could retain his ties to Mozilla as long as he wants to, as a staff member or volunteer.

I don't know how much has changed since I left Mozilla, but there were, and probably still are, a number of former employees and volunteer contributors that had a great degree of influence and input on various projects.

Heck, Troy might even be a good potential addition to the Mozilla board of directors at some point in the future.