Yonke imikhiqizo Isithangami Sokwesekwa

My firefox just upgraded and erased all my history and bookmarks. I would like to restore my bookmarks, but the help desk process won't work because it won't list a history from which I can reload the bookmarks. I know there is a process, but I can't find help to restore my bookmarks,

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