Competitive advantage? I think you mean core competency.
Being a browser maker isn't really an advantage unless you leverage that in some other business like a website, web development solutions or (with enough market share) locking people into your ecosystem.
The real competitive advantage goes to Google. They control the most popular search engine and mobile platform. They can make or break just about any app or website. Their browser just fortifies their dominance.
Mozilla is hardly unique there. Webkit and Chromium are also open source and Google is pro-Web as well.
The only real advantage Mozilla had was the technical advantage of having one of the few popular and mature browser engines available of which only their programmers knew well enough to work on. Since Webkit though, that advantage has disappeared.
You could say their image as a non-profit out to do good is a advantage. Maybe that is something they should work on.
Being a browser maker isn't really an advantage unless you leverage that in some other business like a website, web development solutions or (with enough market share) locking people into your ecosystem.
The real competitive advantage goes to Google. They control the most popular search engine and mobile platform. They can make or break just about any app or website. Their browser just fortifies their dominance.