It is closer to 20 years. She was a founding member of Mozilla. Look back at the early financial statements, in a vacuum a few 100k to several 100k sounds like a lot. When you compare it to other executives in the Bay Area or the US she was significantly under paid compared to peers. Especially when considering stock options. What would it cost Mozilla to hire someone else?
Before someone here says that they would be the CEO for less money than Mitchell. Can you get an appointment with the vice president of search at Google and Microsoft? Could you call their bosses and get though?