Add to Mozilla's perceived not-very-good management and you have a death spiral on your hands, and more power to Google and Apple to shape the Web towards their interests.
FWIW, first-class profiles support matters a lot: https://medium.com/sort-of-like-a-tech-diary/profiles-the-on...
This itself is one issue; there are also all sorts of adventures they decide to go for little to not at all related to the browser development, and which are conducted to convince people all around the world that they're a good humane corporation that cares. Igh.