Mozilla has plenty of engineers. I wouldn't underestimate the degree to which the engineers themselves are pushing for AI features. After all, they are working at a nonprofit organization for below-market wages, and will at some point need to brush up their resume for the next gig. Browser development is cool, but FAANG doesn't hire for browser dev, they hire for AI.

By working on AI-whatever, the engineers have a reason to stay at Mozilla, and will have a "desirable" skillset when they eventually leave. That's something a CEO would need to take into account.