The latest update of Firefox made shortcuts useless

Since the 153.0 update, the shortcut algorithm has dramatically worsened. First, it assigned too much weight and too sensitive to the recent visits, such that all of the top row in shortcuts are populated with random recent visited websites even though they are likely would never be visited again. Second, neither 'dismiss' or 'delete from history' would clear those unwanted shortcuts. Each shortcut seem to be on the URL level, not the domain. As a result I can never clear those random recently visited domains as I have to delete each single URL I visited. Please revert the algorithm to pre-152.