I'd like to pin a URL to the Dock and have its icon be something meaningful or recognizable.
By default, the icon/shortcut is a generic spring icon.
How can I create or modify a docked URL shortcut to be the site's favicon or an image I choose?
1- Move/drag the shortcut to the Desktop first
2- Find an image (on the web, etc.) Open it in Preview, Select All, and Copy.
3- Open Get Info on your shortcut on the Desktop. Select the current icon at the top left of this window. It will highlight to be blue.
4- Command-V to paste the image over top of the icon.
5- Close the properties window.
6- Drag the shortcut icon to the Dock