I have recently noticed that the three dots on the top right side of each Facebook post or advertisment are missing. I can no longer edit, delete or report any posts. I am using the most recent edition of Firefox - 89.0 (64-bit). I think the problem may have started when I updated to the most recent edition of Firefox. Restarting my PC sometimes allows a temporary return of the three dots. I have no problem accessing Facebook with Microsoft Edge.