Interesting, it seems that while IronFox has the protections activated by default (and with some changes) you can also activate most of them on Firefox.
https://github.com/ironfox-oss/IronFox/blob/dev/docs/Features.md#fingerprinting
Ironfox Devs themselves say that the only browser that can truly protect you against fingerprinting is the Tor Browser.
https://github.com/ironfox-oss/IronFox/blob/dev/docs/Limitations.md
Do you feel IronFox breaks many sites for you?