There is a basic misunderstanding in OP's formulation: a "firewall for" is something one needed with Windows XP and earlier, as in a piece of software that acted as a firewall; nowadays, both Windows 7+ and Linux come with a built-in firewall, that one might want a "GUI for {}'s firewall".
Whether people feel more inclined to explain the misunderstanding, or to just spew a "you can't" that's technically correct but unhelpful... YMMV, different people are different and may be of different mood at different times 🤷