Pros
Mozilla was once a great place to work for. Interesting technical work and great people to work with. High base salary plus cash bonuses. Fantastic work life balance since there isn't much work to be done. The CEO canceled all projects except for Desktop Firefox, which fewer and fewer people use. Even most engineers use Chrome. Everyone is just coasting.
Cons
Management is rotten to the core. The company is very top heavy with some 30 executives that travel the world first class to have meetings in lavish places but in the end nothing comes from it. The company hasn't had a coherent strategy ever since Brendan Eich left. Mozilla is supposedly a tech company but the CEO lacks any technical expertise or vision. Of the 30 executives maybe one knows how to write code. The rest of them are friends of the new CEO. Grifters and looters. He drove out all the executives who built Mozilla.