I'm one of the 70. There were no signs that this was imminent, although Mozilla has been struggling financially for many years. I expected that it would happen eventually; I'm relatively well-prepared for it; and it's not too shocking. I did however expect that there would be some warning signs in the lead-up, but that was not the case.

I was working on Cranelift, the WebAssembly compiler that is also a plausible future backend for Rust debug mode. Before that, I worked on the SpiderMonkey JITs for 9 years. If anyone has need for a senior compiler engineer with 10 years of experience writing fast, parallel code, please do let me know.