I've said on here for years that Mozilla will only be remembered for Rust and they should double down on that (to the exclusion of FF if necessary) and people got mad. It's their only product people are enthusiastic about, the only product of theirs that has a positive slope on Google Trends. They could have been what JetBrains is to Kotlin. They could have sold support, training, consultantcy, IDEs, tooling, hosted conferences, etc.