How to use CPU limit on Firejail and Mozilla Firefox

[Virus800200]

This is not an issue or a bug, I just search for a person who can explain to me, step by step, how to Cpulimil Firefox from Firejail/firetools . I want to limit the 6 cores of my processors to something like 25% maximum, or 1 core bellow 40%

Linux Mint cinnamon 21.2 - Kernel 5.15.0-117-generic

• firejail_0.9.68-apparmor_1_amd64
• firetools_0.9.64_1_amd64
• Mozilla firefox for linux mint: Mint-001-1.0

Thanks in advance.