You’re omitting something crucial though. Between the commercial Netscape and the open-source Firefox, there was the open-source Mozilla browser. Firefox wasn’t the Mozilla organisation’s first free and open-source browser. Firefox was the cut-back reboot of the open-source Mozilla browser. So clearly Mitchell’s work to create a spin-off for Firefox wasn’t necessary for them to have an open-source browser.

Besides which – forming a spin-off company seems like super basic stuff for a lawyer? Why are you describing it as if it’s some crucial innovation?