I made a favicon.ico which is displayed at the beginning of the URL. Now it is also displayed on the tabs in Firefox. (First it kept displaying the default icon.) I would like the icon also displayed when bookmarking a page.

I just see it is a little different.
When I click on the bookmark, my favicon is displayed by the bookmark. Is there a way to do this immediatly when I create the bookmark?

Also there are some pages (not mine) that when I visit them show a icon on the tab and before the URL, but not by the bookmark. For example http://bni.com/.
What could be the problem with those pages?