OK so I went into safe mode and used the Avast cleaner to completely remove the program, restarted, then reinstalled from a fresh copy of Avast.

Open Firefox and unticked ‘Do Not Track’ and ‘Community IQ’. Restart Firefox and they are ticked again :-\

Then I tried the the same in my desktop with the same result! Settings aren’t kept and Avast keeps forcing me to send data to their server unless I opt out every time I open the browser…

Is this a limitation of the Free version or some incompatibility with Firefox as at the moment the only way I can stop Avast tracking me is to disable the web component completely (or use another AV program) ???