tl;dr: A 15-year Mozilla veteran is leaving, arguing that leadership repeatedly fails Firefox by chasing DAU growth through copying big browsers and trendy "moonshots" instead of leaning into what made Mozilla successful: being a deeply open-source, niche, community-driven project. He recommends Mozilla get boring, fix tech debt, stop killing successful projects (Thunderbird, Rust, Servo), and rebuild its volunteer community rather than treating contributors as mere customers. He's burnt out and skeptical leadership will change, since Google's search money keeps bad ideas funded.