Currently running Firefox 72.0.2 on Windows 7 Desktop PC. Believe these problems were caused by the ‘Enhanced Tracking Protection’ (ETP) feature, but no matter what remedy I follow on FF support, I cannot cure the problem. (1) Problem seem to be common to both Ancestry & Facebook websites & relates to viewing messages which use a (pop-up/fly-out?) window. Ancestry’s support solution was to install chrome & so far Facebook support has not responded. I can work around this by using my chrome laptop to read & reply to messages on both websites, but this is a real pain since all this worked fine on FF before. (2) AVG has the same problem populating (pop-up/fly-out?) window for ‘performance issues’. Obviously I cannot use another PC or laptop to check this out, so I am stuck. All suggestions welcomed, but note I am a novice at all this, so please be gentle!! Cheers, Mickey. P.S. I have more info, but this is all a bit overwhelming & so I won't add it at moment