ant to customize the color combinations and background textures of your Firefox browser? Sign up for Test Pilot to try out Firefox Color before it's released to the rest of the world.ant to customize the color combinations and background textures of your Firefox browser? Sign up for Test Pilot to try out Firefox Color before it's released to the rest of the world.ant to customize the color combinations and background textures of your Firefox browser? Sign up for Test Pilot to try out Firefox Color before it's released to the rest of the world.ant to customize the color combinations and background textures of your Firefox browser? Sign up for Test Pilot to try out Firefox Color before it's released to the rest of the world.ant to customize the color combinations and background textures of your Firefox browser? Sign up for Test Pilot to try out Firefox Color before it's released to the rest of the world.