I use the email server fastmail.fm inside the Firefox browser on a 2023 Macbook pro. In the main everyday pane (the list of emails) there is a right-hand scroll bar. Frequently that scroll bar is MUCH too long, so that I cannot scroll all the way to the bottom of the list of emails. Both Apple and fastmail.fm are pretty sure they are not responsible. When the scroll bar is too long, I know a work-around, but I would like the problem not to happen.