Is it the Favicon support you are asking for?
You should open an other discussion thread about that Yoda.
FYI, 51 bugs are reported today with this keyword in Mozilla (1.2): see the
Bugzilla querry. So it's not really a closed topic
Today in Mozilla you can have a .ico .gif or a .png image (probably even a .bmp and possibly a .jpg) used as a "favicon", instead of the simple favicon.ico file used in IE.
in the header of the page you write
<link rel="SHORTCUT ICON" href="/image/favicon.ico" />
<link rel="ICON" href="/image/Moz_icon.png" type="image/png" />
in order to give a favicon to IE and an other one, if you wish so, to Mozilla browsers.
The picture displayed in Mozilla (when everything works and when the "browser.chrome.favicon" property is true) will be in the bookmark, in the URL bar and on the the tab.
more on favicons in general on this page
http://www.hostingforhumans.com/faviconfaq.html
/M