Since I am also rather slow on the uptake note1 at times, here are the ELI5 note2 instructions: I have had a couple of friends who did not understand when I told them something like Go to: chrome://extensions in your browser. One addition to his instructions, that will only apply to a few folks. That should do it in Firefox until the cookie that AOS uses gets deleted. At that point, a separate tab should open and you should see 'avast! avast! online security settings' screen.
If you want to keep the Avast! Online Security add-on but kill the Safe Price Most of the online security comes from the Web Shield and Firewall, so the loss of protection from disabling the 'Avast! Online Security' add-on is limited.