Online application through their careers page. I was contacted about 1 week later by HR and had 4 phone interviews over the course of 1 month. 2 technical and 2 regular conversations with management positions. After passing those, I was brought in for an onsite interview with 8 individuals over the course of a full day. Half of the interviews were through a video conferencing system Mozilla uses. The entire process took over 3 months and there were long periods of silence. HR was not responsive and often left me wondering what was going on. Overall, Mozilla is an extremely slow company since half of the employees are remote and communication takes extra time. I noticed there were very few employees under 30 years of age, which I found interesting for a tech company. Even from the interviews, I felt like the company was stuck in a bureaucratic mess where there was a frustration between old and new ways of development. Two employees during my interview process mentioned that it was extremely hard to create change and bring in ideas since the majority of senior engineers have been at Mozilla for a long period of time and had a set way of doing things. I was a little shocked at how many internal problems seemed to occur at Mozilla. Many engineers made it clear that working on OSS had many weak points and wanted to make sure I fully understood the drawbacks before considering Mozilla. Having said all that, I did speak with highly passionate and talented engineers, managers, and directors. Their insights were fascinating and they all seemed excited to be part of the Mozilla organization. They all knew their field very well and held pride in their work. I would say the individuals were great, but the way Mozilla is run at a company level was restricting their capabilities and ideas. Overall, you would have to be extremely passionate about OSS and user privacy to consider all the negatives accepting all the negatives that come from a company run like Mozilla. PS: An interesting bit of information I learned from the interviews -- Firefox downloads have been steadily declining for some time now and their main business partner, Yahoo!, is not doing well.