When I minimize a page it seems to disappear. Where can I locate it?
The minimized pages used to appear in a panel at the bottom of the screen. The panel is there, but not the minimized pages.Also, Yahoo used to indicate how many unopened emails in the same panel. That has also disappeared.Thanks.
The thumbnails on the about:newtab page are generated from the cache, so if the page is not in the cache or otherwise can't or won't (secure pages) be rendered as a PNG image then you will get an empty box.
Do not use Clear Recent History to clear data like the cache and the history when you close Firefox
If there is no history then you get an about:newtab page with empty boxes (no URLs).