Custom favicon
By Anatoly Mironov
It is easy to use a custom favicon, put a ico image into a mapped folder Images and then locate this line in your master page:
<SharePoint:SPShortcutIcon runat="server" IconUrl="/\_layouts/images/favicon.ico" />
```And replace it with your ico:
<SharePoint:SPShortcutIcon runat=“server” IconUrl="/_layouts/images/CONTOSO/favicon.ico" />