Three examples off the top of my head — PostgreSQL, FreeBSD, and Debian — are doing just fine without someone "taking responsibility" (when have Mozilla's CEO ever done that?).
Debian has an elected leader that is not paid and has pretty limited authority overall.
There's also the Linux kernel, with Linus doing both managerial and technical work, running circles around Mozilla's leadership in both. He makes just a few millions per year, less than Baker did even two years ago AFAIK.
I think all of these projects have contributors who are getting paid at other companies for the work, notably Linux. Not quite so for Firefox. I mean, tell me where does Linus get his income? You think that can be fully replicated for Firefox?
Debian has an elected leader that is not paid and has pretty limited authority overall.
There's also the Linux kernel, with Linus doing both managerial and technical work, running circles around Mozilla's leadership in both. He makes just a few millions per year, less than Baker did even two years ago AFAIK.