Mitchelle Baker, CEO of Mozilla since 2020, will transition back to executive chairwoman role. Baker had been executive chairwoman for several decades. Board member Laura Chambers is taking over as interim CEO. Second source; The Verge
You’re talking about Thunderbird, a project they basically abandoned to the community. Thunderbird survives in spite of Mozilla, not because of it. Meanwhile their main product Firefox is still bleeding users down into the single digit percentages while receiving half a billion a year from Google. It takes a lot of skill to run such a company so deep into the ground.
Mozilla has a podcast?
Edit: Yes they have! https://irlpodcast.org/
Assuming you meant that they talked about this topic in one of their podcasts? Would you mind sharing which episode they did that in?