As far as I can tell, OP's talking about the replacement of Mozilla Corporation CEO Brendan Eich, who had an engineering background[0] and was CTO but made a small but controversial donation to an anti gay marriage campaign, with Mitchell Barker, who came from a legal background and was formerly the president of the Mozilla Foundation.

At the time this was pretty divisive, because it was a candidate with objectionable social opinions but great technical chops getting ousted by a candidate who was uncontroversial but seen as more business-minded and more inclined to broad-spectrum activism outside the confines of Firefox's typical free software and online freedom work.

[0] he was the creator of javascript, among other things