As stated, the offer is for a job that's almost sure to fail and will damage the taker's career if it does. Combine that with undermarket pay and it's definitely a tough ask, even if you restrict yourself to those who feel strongly about Firefox's mission. If you buy into the notion that an effective CEO has a particular, rare set of skills in business strategy and people management, then your job gets even tougher.

Most people cheered when Pat Gelsinger came back to Intel and I bet he even believes in Intel's mission, but he likely wouldn't have accepted an 80% pay cut relative to other industry CEOs. And Intel's prospects are infinitely better than Mozilla's.