I worked at Mozilla for three years, and loved it, despite the lack of leadership at the company at the time. I still am zealous for open source due to my Mozilla experience. I could have stayed there forever and been happy, but Google made me an offer I could not refuse.
Yeah, their mentored bugs program for contributors is great, and if I wasn't concerned with my career trajectory at the moment I would probably just continue out of pure interest & for the learning opportunities.
Do you think career advancement from continued contributions is likely in my case though? Or should I invest my time elsewhere?
Understanding the process and workflows to being a productive open source contributor is useful. But perhaps find an open source project where the stewards are actively hiring and pay well.