I don't know what their definition of a "real user" is. But everyone I've met who uses Fiercefox does so for philanthropic or political reasons. I have a hard time believing some non techie in Minnesota has noticed performance improvements. Idk, the data looks very pseudo sciencey, just feels like another marketing ploy from the blue haired people.
Generally we say "real users" internally as a comparison to benchmarks, as in "this improves JetStream by 5%, but I don't think it will make any difference to real users".
