Eich was CEO for 11 days. You’re wildly misremembering how much of an impact he had in that post.

It was an eleven day war and the casualty was their future. Eich was the last time that Mozilla hired a CEO from the ranks of its own engineers. Eich would not have prevented the economic external challenges faced, but Eich and other such engineer-leaders would have prevented the unforced errors Mozilla is known for today. Every CEO after that was business, not engineer. This placed the company onto the same runway of mediocrity and collapse that we see Boeing crashing planes into with some regularity.

What Boeing did to all the guys who remember how to build a plane (2 years ago, 532 comments) https://news.ycombinator.com/item?id=39856413