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Only about 15% of Linux is made by community. Rest is done by huge companies.

The project you’re talking about - a massive open-source project written mostly by the employees of huge companies - is Chromium. Chromium is written by two large companies, plus some consultants and such payed by smaller companies. Or at least, Chromium is closer to the Linux model than Firefox.

But Linux has a lot of contributions from developers payed to do so by many companies. Linux isn't made solely by hobby developers in their spare time.

That's what Mozilla was originally. However, like many things, maintaining the very fast moving world of web is easier when you have a paid team, which leads to the business, which leads to corporate politics and thinking that a good CEO is worth multiple millions.