DavidR
7
For me that only opened once, when I enabled the AOS add-on after the avast update (I had it disabled before the update) and not again since (having closed that tab).
Whilst it might well have something to do with cookies, but that should only relate to a specific sites AOS settings. This shouldn’t mean the AOS add-on welcome screen (when first enabled) would always load.
Also the firefox History setting I would have though that would be more likely to stop opening it as the history isn’t remembered (when firefox is closed), so it should open with a single blank tab.
I don’t clear history when I close firefox, I use CookieMonster (CM) to manage cookies, in CM I have allowed cookies for avast.com, forum.avast.com. I also have some of my regular sites allowed in CM, otherwise by default only session cookies are allowed, which would be removed when firefox is closed.
I prefer to use CM to manage cookies rather than firefox as it is more customisable.