Everyone on that list worked for the Mozilla Foundation, and would not have reported to Brendan as CEO of the Mozilla Corporation (which made that tweet misleading at best). I referred to that group already in the comments here.
AFAIK no Mozilla Corporation employees spoke out publicly in this manner, and internally I did not hear any such sentiments from Corporation employees. On the contrary, a lot of Corp employees expressed anger at that Foundation group ... not because they supported Brendan's Prop 8 position, but because that Foundation group poured fuel onto a fire that was doing great harm to Mozilla.
https://arstechnica.com/information-technology/2014/03/mozil...