Two free actions, such as Swap Matrix Attribute. So you'd swap your high stat into whatever action you're doing this turn, then swap it back to Firewall after you do whatever you're doing. Also note, this lets you move Overclocker too. So, you could be running a 1 Attack, 1 Data, 4 Sleaze, 5 Firewall (IIRC that is Hornets stats) Overclocker into Firewall + Stealth+Encryption+Smoke and Mirrors so ADSF 1 1 10 7 On your turn you need to do an Edit File action so Free action Swap Matrix Attribute, ADSF goes to 1 6 6 2 , more than enough to get your Edit file done, then Free Action swap it back to your 1 1 10 7 for defense.
Also Free action dial down Smoke and Mirrors, then back up after your action if you don't have enough noise reduction. Or Free Action to swap in a program to help you do a thing, swap back to your defensive set up.
Very, handy for a Decker.