Attributes(s): Static File Name, Customizable File
Summary: The favorite icon is the image used in page tabs. It's also the image that appears beside favorites and bookmarks.
A favorite icon can easily be created in GIMP. Start with the smallest size image, and continue to paste new layers that are of a bigger size.
Google has really set/led the standard for a favorite icon file size. You can get away with only having a 16x16px (pixel) layer, I like to add a 32x32 as well (Browser grid links.).
Publicdomainvectors.org is a great place to select a favorite icon from.