Add 16×16 favicon after all the links in your posts. 
The favicon’s tag has a ‘favlink’ class so you can CSS it as you wish.

Karedas Favicons

Adds corresponding favicon from Google Shared Stuff after every links in your posts.

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Add a favicon.
Set the favicon URL under Appearance > Customize > Site Identity > Site Favicon.
This plugin is especially useful if you’d like to set a Site Icon, but also need to set a unique favicon separate from it.

Karedas Favicons vs Site Favicon