Avast Secure Browser imposes itself by opening on start up despite my attempts to stop it doing so. AND despite Firefox being my default browser for over ten years and long before I started using Avast free antivirus. Avast has loaded it on , I never elected to do so ...but that said I do not wish to totally remove it from my lap top as it is, as it were, an insurance policy against Firefox becoming inoperable. I have explored switching off this attribute of avast browser in the browser but to date have been unsuccessful. As a retired man in my seventies I am limited in my peer group for finding anyone that is computer literate YET this technology is so beneficial to people such as myself I believe.