I believe your confusion stems from a misreading of "as you indicate with your use of Firefox". You're reading it like "by using Firefox, you indicate".
Contemplate the difference between
"The car is allowed to move as you indicate with the controls."
versus
"By using the controls, you indicate the car is allowed to move."
The former explicitly only allows the car to realize your intent, whereas the latter gives the car license to do whatever it pleases.