https://en.wikipedia.org/wiki/Mitchell_BakerPresident and founder of the Mozilla Foundation 2003 onwards, and also previously CEO of the Mozilla Corporation 2005-2008. Also she wrote the Mozilla Public License before that. I suspect she knows a little bit more than Word and Excel.
Seriously - go criticize her for her salary, or failure to execute, or for-profit vision, or something. There's lots of criticisms that can be actually substantiated. The hypothesis that she doesn't understand what Mozilla is requires significant evidence. It's entirely possible a Mozillian could show up and say that actually she's been a clueless and politically savvy leader, but outsiders speculating that she can't possibly be qualified need to provide more than speculation.