Mozilla Corporation -- which makes Firefox -- is a wholly owned subsidiary of Mozilla Foundation. The foundation is a nonprofit.
A nonprofit can't generate a lot of business income unrelated to its mission. Firefox used to generate a lot of income, so it had to be spun off into a taxable entity called Mozilla Corporation.
The corporation doesn't have investors in the usual sense.
@tetris11 @GnuLinuxDude
Netscape exited to AOL in 1998. The Netscape founder Marc Andreessen has since then been a successful venture capitalist who loves cryptocurrencies and Donald Trump.