Q: Will Firewall iP reduce battery life?

A: No. Firewall iP is only active when an app is running.

Q: Will Firewall iP use lots of memory?

A: No. The MobileSubstrate part of firewall isn't big and it isn't using any memory extensive methods.

Q: Will Firewall iP reduce performance?

A: No. It's not resource hungry :) However, an app might try to continuously establish a connection, leading to many calculations.

Q: Is a daemon running always in the background?

A: No. The code is injected directly into the apps and Firewall iP is not active if there is no active application.

Q: I've purchased FiP via CydiaStore, when I try to install it through Rock the app asks me for a license

A: CyidaStore and Rock use different licensing-systems. Install it through the app you bought it with.