favicon

where its used???
Browsers displays a page's favicon in the browser's address bar, next to the page's name in a list of bookmarks and in tabbed browsing tabs.

how to enable favicon in firefox???
# In the address bar, type about:config
# In the filter box type icon
# Set browser.chrome.favicons to true
# Set browser.chrome.site_icons to true
# Restart Firefox

www.avaya.com
www.nortel.com
www.google.com
www.iplt20.com
www.royalchallengers.com

Reference:
http://www.getfavicon.org
http://www.iconsbank.com
http://www.technipages.com/firefox-enabledisable-bookmark-favicons.html
http://blogneedmoney.blogspot.com/2008/02/how-to-change-favicon-in-blogger-blog.html
http://www.mouserunner.com/Spheres_Icons_Index.html