I want to make it harder to close Firefox. I am used to hitting Close when I finish what I'm doing. But I have recently started to let Firefox save passwords. Each time I start Firefox it asks for the master password. I'd like to avoid this by letting it remain open but hidden. Old habits die hard, and I doubt if I will learn not to hit Close rather than minimise. It would also help if the X to close a tab did not appear when there is only one tab open, as hitting that is another way of closing Firefox by accident. I have come across an add-in for Outlook that makes the Close button minimize instead of closing. (Keepoutlookrunning). I wonder if that could be adapted to work for Firefox as well. As a side issue, when I start Firefox the request for master password does not come up immediately. So, forgetting that the request will appear, I start typing in the address or search bar. Suddenly the request appears, and what I am typing goes into its password field instead of where I was typing. I think it would br better if the request did not move focus to itself.