A CEO post have everything to do with the public perception you create of the company, though. And deservedly or not, his position coupled with his opinions on prop 8 have come to have an impact on the perception of Mozilla. In that respect, the personal views of a CEO often does have something to do with their personal views in a way that is rarely the case for less public-facing positions.
Since his role had exactly zero to do with his personal views, you could say this about any future job as well.