It's also not a particularly good look when your own salary keeps rising while you're laying people off and market share keeps plummeting (in my neck of the woods, Firefox actually used to be dominant at 60%+)...
That said, I haven't looked at this in any kind of detail, and all I know of Baker is what her Wikipedia article tells me, which includes writing the Mozilla Public License, managing mozilla.org on a volunteer basis for a while and being instrumental in the creation of the Mozilla Foundation.