Help! I want to remove avast! Online Security on Firefox. I am using the latest avast! and it. In Firefox’s Add-ons Manager, there’s no Remove button for avast! Online Security. Help! I don’t need it. 
I’m using Windows 7 32-bit, latest version of avast! and latest version of Firefox.
Control Panel-Uninstall a program-Avast-Uninstall/Change.
Choose Change and uncheck Browser Protection.
This will remove AOS add-on from all browsers.
Thanks!