sojweb

<ul>
<li>1.0.2: output tags as XHTML</li>
<li>1.0.1: fixes a path problem.</li>
</ul>
Just a real simple plugin to change the favicon for the admin pages; helpful if you’ve got a bunch of tabs open in Firefox (or some other browser that displays favicons in the tabs) so you can quickly see which tab is admin and which is not.
The WordPress icon is provided by default. To set your own, just copy it to the plugin folder.
Let me know of any problems: jj56@indiana.edu

SoJ Favicon

Just a real simple plugin to change the favicon for the admin pages; helpful if you've got a bunch of tabs open in Firefox so you can quickly see …

Chip Bennett

As of WordPress 4.3, this Plugin is no longer needed. The next update will integrate the Plugin into the core site icon feature, to allow for graceful 
retirement of the Plugin.
Add a Favicon to your site. No bells or whistles; simply upload a (ICO, PNG, or GIF) file.
Note: Plugin settings can be configured via Dashboard -> Settings -> Favicon.

cbnet Favicon

Add a Favicon to your site. No bells or whistles; simply upload a (ICO, PNG, or GIF) file.

SoJ Favicon vs cbnet Favicon