This XML file tells the browser how to handle search queries from the address bar. OpenSearch description format - XML - MDN Web Docs
If autodiscovery doesn't work, you can manually configure the search engine. : Go to the Manage search engines page in settings. Click Add under "Site search". Enter a name and a keyword (e.g., os ).
Scroll down to "Search Shortcuts" and click . (Note: You may need a browser extension like oSearch for more advanced manual additions). For Website Developers
The site should appear under "Inactive shortcuts" or "Recent"; click to add it. Mozilla Firefox : Navigate to the website. Click the Address Bar or the three dots in the address bar.
If you are trying to provide OpenSearch to your users, you must include an OpenSearch Description Document (OSDD) in your site's header:
Most modern browsers will detect if a website supports OpenSearch automatically. :
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