When I click on the reveal button against a folder in my my sidebar it opens and shows the list of individual websites as expected but when I click on the chosen bookmark it disappears although the web page opens, then when I close the reveal button on the bookmark folder that folder disappears leaving a blank space. I can restore the full sidebat list b either clicking on a bookmark that is not in a folder or by clicking the home button in the browser. The attached images show what I mean. I am running Mac OS Monterey on a Mac Studio Max There seems to be a bug or I have something set wrong. I have tried redownloading Firefox but the same problem persists. Help please