When I first start Firefox if I click on the Bookmarks icon a drop-down
box appears asking if I want to bookmark this page. Then it works
correctly until I start it up again. If I click on History, it will
cycle backwards at least one page, then work correctly from then on.
This has been happening for several versions now, so I suspect it is
some setting that I messed up. I looked at about:config but haven't
found it yet.