jediconcepts

A WordPress plugin that adds unique favicon support for each domain mapping in the <a href="https://wordpress.org/plugins/multiple-domain-mapping-on-single-site/" rel="ugc">Multiple Domain Mapping on single site</a> plugin.
Plugin Repository: [https://github.com/jediconcepts/multi-domain-favicon-manager] 
Support: dev@jediconcepts.com
<h4>Features</h4>
<ul>
<li>Unique favicons per mapped domain – Set different favicons for each of your mapped domains</li>
<li>Media library integration – Upload new favicons or browse existing media</li>
<li>Smart domain conversion – Automatically converts URLs between base and mapped domains</li>
<li>Conflict resolution – Removes WordPress default site icons to prevent conflicts</li>
<li>Search functionality – Find favicon files by filename when media browser filters them out</li>
<li>Multiple file format support – Works with .ico, .png, .svg, .jpg, and .gif files</li>
<li>Auto-preview – See favicon previews when entering URLs manually</li>
</ul>
<h4>Requirements</h4>
<ul>
<li>WordPress 5.0 or higher</li>
<li>PHP 7.4 or higher</li>
<li><a href="https://wordpress.org/plugins/multiple-domain-mapping-on-single-site/" rel="ugc">Multiple Domain Mapping on single site</a> plugin (required dependency)</li>
</ul>
<h4>How It Works</h4>
Frontend Behavior 
When a visitor accesses a mapped domain:
<ol>
<li>Plugin detects the current domain mapping</li>
<li>Checks if a custom favicon is configured for that mapping</li>
<li>Outputs the custom favicon HTML tags</li>
<li>Suppresses WordPress default site icon to prevent conflicts</li>
</ol>
Admin Interface 
The plugin adds favicon management fields to each domain mapping:
<ul>
<li>Integrates seamlessly with the existing Multiple Domain Mapping interface</li>
<li>Provides intuitive upload and selection tools</li>
<li>Shows preview of selected favicons</li>
<li>Validates favicon URLs automatically</li>
</ul>
<h4>Button Functions</h4>
<ul>
<li>Upload New (Blue) – Upload fresh favicon files from your computer</li>
<li>Browse Media (Green) – Select from existing files in your media library</li>
<li>Search by Name (Orange) – Find specific files by filename when media browser doesn’t show all files</li>
<li>Convert URL (Purple) – Convert between base domain and mapped domain URLs</li>
</ul>
<h4>File Format Support</h4>
Supported favicon formats:
<ul>
<li>.ico – Traditional favicon format</li>
<li>.png – Modern format, recommended for most uses</li>
<li>.svg – Scalable vector format</li>
<li>.jpg/.jpeg – JPEG images</li>
<li>.gif – GIF images</li>
</ul>
Recommended size: 16×16 or 32×32 pixels

Multi-Domain Favicon Manager

Got to give this 5 stars

Unique favicon support for each domain mapping in Multiple Domain Mapping plugin.

Multi-Domain Favicon Manager vs Ultimate Multisite – WordPress Multisite SaaS & WaaS Platform