application rule based firewall for linux

I think, Linux, currently needs application-based firewall .What is your opinion?
please first reserch about “application-based firewall” and then answer.

There are several in existence already, although the ‘user friendliness’ of them is questionable. Probably the easiest to use is Leopard Flower but it has a way to go. Other than that you have AppArmor and SELinux

All of the applications you mention are confusing and Not user friendly.
I intend with this procedure, a suggestion (request) send to comodo.
please help me and yourself by your answer