static/opensearch.xml

<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/" xmlns:moz="http://www.mozilla.org/2006/browser/search/">
<ShortName>Open WebUI</ShortName>
<Description>Search Open WebUI</Description>
<InputEncoding>UTF-8</InputEncoding>
<Image width="16" height="16" type="image/x-icon">http://localhost:5137/favicon.png</Image>
<Url type="text/html" method="get" template="http://localhost:5137/?q={searchTerms}"/>
<moz:SearchForm>http://localhost:5137</moz:SearchForm>
</OpenSearchDescription>