Parent indicates that the same power users that hat first adopted Firefox, before it had any market share or was known to regular people around the world, will be the ones who save it. Those are, in industry parlance, "early adopters".

Those early adopters would have been adopting Phoenix 0.2^ which was released in September 2002, that was later released as Firefox 1.0^ two years later — at a time when the only power users could have been those same "early adopters".

Those early adopters would have been as I describe: technical users with the capability to install and operate an unfamiliar browser for the sake of curiosity. (I was still using MSIE in 2002, so it's not like it was universal among technical users either, yet.)

Those early adopters do not represent the total set of power users today.

^ https://en.wikipedia.org/wiki/Firefox_early_version_history