There should be nothing wrong with just bring good at what you do and not seeking endless expansion (and yes, I know, it's actually dangerous because you're vulnerable to predation in that position).
On the contrary, a lot of (offline) companies are deciding that diversification is bad and they should divest everything outside of one core business. Be it ThyssenKrupp, Alsthom, Bombardier, GE, Phillips, take your pick.
However many web companies choose to diversify. Why not? It helps them retain and gain users, and protects them against heavy hitting competitors (FAANG can copy your business model and features quite quick). E.g. take someone like Snapchat - their features were copied by competitors and they had no differentiator, so they floundered. A Telegram or Signal was little differentiation bar potential diversification, which is why both tried some crypto crap.
It baffles me that Mozilla had/has multiple offices located in some of the most expensive real estate markets in the world. Not just in those markets, but in the very-most expensive parts of said markets.
For example, in Boston they're dead center downtown, for no explicable reason other than the prestige.
It feels like a kid who received 5 games for Christmas and doesn't know what to do.