I would like private tabs to stay open when I close the browser so that I can return to them later. Until recently, this was the behavior my version of Firefox (139) was exhibiting. But now, using 141, it's closing all private tabs every time I switch to another app. I saw that starting in version 129, there is a "Close private tabs" option that you can toggle off. However, I do not see this setting in version 141 for Android. How can I get the behavior back of persisting private tabs?