Firefox Hello stands out to me as another case of Mozilla stubbornly trying to make something work for much longer than anyone on the outside would have advised

Firefox Hello stands out to me as another case of Mozilla stubbornly trying to make something work for much longer than anyone on the outside would have advised. It started as an intern project to demo WebRTC and persisted for 3 years amidst incessant predictions of its doom. Thunderbird has received continuous development and maintenance for coming up on 15 years since its public release.