[nnethercote]

I think there is confusion here over the meaning of "Rust developer".

Mozilla did lay off most of its employees that were working directly on the Rust language and its implementation. This was a handful of people.

Mozilla also laid off some employees that were using Rust, such as the Servo team.

But Mozilla still has plenty of employees that know and use Rust, both in Firefox (e.g. the WebRender team), and in code relating to Firefox such as services. This is a much larger number of people.