Firefox 54 and later will treat URLs without any host name, such as
Also, HTML forms containing a URL-type input control like this will not be validated unless the value is changed manually or dynamically:
<input type="url" value="http://">
In this case, you can replace the
value attribute with the
placeholder attribute to work around the issue.
Update: This change is affecting EarthLink Web Mail where the customers have difficulty in sending messages.