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Firefox keeps adding www. prefix to my domain name in address bar.

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I have the subdomain www as a different IP address as my domain name. Even after setting browser.fixup.alternate.prefix to false in about:config, Firefox keeps adding www. to my domain name. After searching google for a solution, it seems this workaround in about:config worked back in 2017, but doesn't seem to work for me with the newest Firefox. Any other solutions? Internet Explorer does not have this issue for me.

I have the subdomain www as a different IP address as my domain name. Even after setting browser.fixup.alternate.prefix to false in about:config, Firefox keeps adding www. to my domain name. After searching google for a solution, it seems this workaround in about:config worked back in 2017, but doesn't seem to work for me with the newest Firefox. Any other solutions? Internet Explorer does not have this issue for me.

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Does this problem occur with a full URL such as https://example.com ?

The top bar of the drop-down usually shows what Firefox intends to do with the text if you submit it at that point. Does the in-URL-bar autofill feature show you the address you want, or is it not suggesting either match?

In case the problem is a cached redirect, you could clear the web cache: How to clear the Firefox cache (in the Clear Data dialog, don't remove all your cookies and site data, just clear the cache for now).